MXC6225XU DTOS - Memsic Inc. - Datasheet.Directory

One Technology Drive, Suite 325

Andover, MA 01810, USA

Tel: +1 978 738 0900 Fax: +1 978 738 0196

www.memsic.com

Information furnished by MEMSIC is believed to be accurate and reliable. However, no responsibility is assumed by MEMSIC

for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by

implication or otherwise under any patent or patent rights of MEMSIC. Information presented in this document is the property of MEMSIC, Inc.,

is considered proprietary, and is not to be reproduced without the speciﬁc written permission of MEMSIC, Inc.

MXC6225XU -DTOS Accelerometer

Powerful Sensing Solutions for a Better Life

MXC6225XU: Fully Integrated Thermal Accelerometer

DTOS ACCELEROMETER

Document Version 1.0 page 1

Fully Integrated Thermal Accelerometer

MXC6225XU

DTOS ACCELEROMETER

Powerful Sensing Solutions for a Better Life

One Technology Drive, Suite 325

Andover, MA 01810, USA

Tel: +1 978 738 0900 Fax: +1 978 738 0196

www.memsic.com

Information furnished by MEMSIC is believed to be accurate and reliable. However, no responsibility is assumed by MEMSIC

for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by

implication or otherwise under any patent or patent rights of MEMSIC. Information presented in this document is the property of MEMSIC, Inc.,

is considered proprietary, and is not to be reproduced without the speciﬁc written permission of MEMSIC, Inc.

MXC6225XU -DTOS Accelerometer

Powerful Sensing Solutions for a Better Life

MXC6225XU: Fully Integrated Thermal Accelerometer

DTOS ACCELEROMETER

Document Version 1.0 page 2

Features

► Fully Integrated Thermal Accelerometer

► X/Y Axis, 8 bit, Acceleration A/D Output (± 2g)

► Absolute 0G offset less than +/- 50mg

► 4-position Orientation Detection

► Shake Detection with Interrupt

► Programmable Shake Threshold

► Shake Direction Detection

► I2C Interface

► Power Down Mode

► Shock Survival Greater than 50,000 g

► Operating Supply Voltage from 2.5V to 5.5V

► Produces no Mechanical Sounds (“click”)

► Package Size 3x3x1mm

Applications

► Consumer:

Cell Phones

Digital Still Cameras (DSC)

Digital Video Cameras (DVC)

LCD TV

Toys

MP3, MP4 Players

► Household Safety:

Fan Heaters

Halogen Lamps

Iron

Cooling Fans

The MEMSIC Digital Thermal Orientation Sensor (DTOS) is the world’s ﬁrst fully-integrated orientation

sensor. Its operation is based on our patented MEMS-thermal technology and is built using a standard

0.18um CMOS process. This sensor contains no moving parts (such as a ball) and thus eliminates ﬁeld-

reliability and repeatability issues associated with competitive products. It also eliminates the “click”

sounds typically heard in ball based orientation sensors. Shock survival is greater than 50,000g. This

sensor detects four orientation positions, shake and shake direction. In addition, it provides X/Y axis ac-

celeration signals with very low 0g offset. An I2C interface is used to communicate with this device and

an interrupt pin (INT) is provided for shake and orientation. The device also has a power down enabled

through the I2C interface.

General Description

Functional Block Diagram

This sensor is packaged in a hermetically sealed 6-pin surface mount package (3 mm x 3 mm x 1mm); the

product is RoHS compatible and operates over -20~70°C temperature range.

Figure 1

One Technology Drive, Suite 325

Andover, MA 01810, USA

Tel: +1 978 738 0900 Fax: +1 978 738 0196

www.memsic.com

Information furnished by MEMSIC is believed to be accurate and reliable. However, no responsibility is assumed by MEMSIC

for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by

implication or otherwise under any patent or patent rights of MEMSIC. Information presented in this document is the property of MEMSIC, Inc.,

is considered proprietary, and is not to be reproduced without the speciﬁc written permission of MEMSIC, Inc.

MXC6225XU -DTOS Accelerometer

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Document Version 1.0 page 3

Electrical Speciﬁcations1

Sensor Characteristics1

Pin Description: LCC6 Package

Parameter (Units) Conditions Minimum Typical Maximum

Operating Voltage Range (V) 2.5 5.5

Supply Current (mA) 1

Turn-On Time (ms) 300 500

Operating Temperature Range (ºC) -20 +70

VDD Rise Time (ms)210

Parameter (Units) Conditions Minimum Typical Maximum

Measurement Range (g) X/Y Axis ± 2.0

Alignment Error (º) X/Y Axis ± 1.0 ± 2.0

Sensitivity Error(%) X/Y Axis -5 0 5

Sensitivity (LSB/g) X/Y Axis 64

Sensitivity Drift Over Temperature (%) Delta from 25 ºC

(-20 ºC - 70 ºC)

Zero g Offset Bias Level (mg) X/Y Axis absolute

value (-20 ºC -

70 ºC)

-50 0 50

3dB Signal Bandwidth (Hz) 10

Pin Name Description

1 INT This pin is the DTOS interrupt output. The logic level on this pin reﬂects the state of the INT

bit in the STATUS register. INT is set when the orientation differs from the last orientation

read by the processor, or a shake event is detected. INT is cleared upon the read of the

STATUS register.

2 NC During normal operation, this pin should be left ﬂoating.

3 VDD This is the power supply input for the DTOS. The DC voltage should be between 2.5 and 5.5

volts.

4 I2C SCL This pin is the serial clock line for the I2C interface on the DTOS. Since the DTOS only

operates as a slave device, this pin is always an input.

5 I2C SDA This pin is the serial data line for the I2C interface on the DTOS. It is an I/O pin that functions

as an input during a write to the DTOS, and an output during a read from the DTOS.

6 GND This is the ground pin for the DTOS.

Notes: 1All speciﬁcations are at 3V and room temperature unless otherwise noted. 2 Maximum allowable power supply rise time

from 0.25V to 2.5V (minimum). Slower VDD rise time may cause erroneous data retrieval from OTP memory at power-up.

Notes: 1All speciﬁcations are at 3V and room temperature unless otherwise noted.

Figure 2

Top View

LCC6 Package Drawing

Package Thickness: 1.05mm +/- 0.1mm

Figure 3

Bottom View

Figure 4

One Technology Drive, Suite 325

Andover, MA 01810, USA

Tel: +1 978 738 0900 Fax: +1 978 738 0196

www.memsic.com

Information furnished by MEMSIC is believed to be accurate and reliable. However, no responsibility is assumed by MEMSIC

for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by

implication or otherwise under any patent or patent rights of MEMSIC. Information presented in this document is the property of MEMSIC, Inc.,

is considered proprietary, and is not to be reproduced without the speciﬁc written permission of MEMSIC, Inc.

MXC6225XU -DTOS Accelerometer

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MXC6225XU: Fully Integrated Thermal Accelerometer

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Document Version 1.0 page 4

Figure 6

Figure 5

Circuit Schematics

Landing Pattern

Note:

R1 and R2 are pull-up resistors, the value can be determined by customer

INT does not need any pull-up/pull-down resistor

If INT is not used, just keep it disconnected, don’t pull up or pull down

One Technology Drive, Suite 325

Andover, MA 01810, USA

Tel: +1 978 738 0900 Fax: +1 978 738 0196

www.memsic.com

Information furnished by MEMSIC is believed to be accurate and reliable. However, no responsibility is assumed by MEMSIC

for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by

implication or otherwise under any patent or patent rights of MEMSIC. Information presented in this document is the property of MEMSIC, Inc.,

is considered proprietary, and is not to be reproduced without the speciﬁc written permission of MEMSIC, Inc.

MXC6225XU -DTOS Accelerometer

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Digital Switching Characteristics

Symbol Parameter (Units) Minimum Typical Maximum

tr Rise Time (us) 0.3

tf Fall Time (us) 0.3

fSCL SCK Clock Frequency (kHz) 0 400

td1 SCL Low Time (us) 1.3

td2 SCL High Time (us) 0.6

td3 Data Hold Time (us) 0 0.9

td4 Data Set-Up Time (us) 0.1

td5 Start Set-Up Time (us) 0.6

td6 Start Hold Time (us) 0.6

td7 Stop Set-Up Time (us) 0.6

td8 Bus Free Time Between Start and Stop (us) 1.3

Digital Parameters

Symbol Parameter (Units) Minimum Typical Maximum

VIH High Level Input Voltage (Volts) 0.8*VDD

VIL Low Level Input Voltage (Volts) 0.2*VDD

Hysteresis of Schmitt Trigger Input (Volts) 0.1

IIL Input Leakage, All Inputs (uA) -10 10

VOL Low Level Output Voltage (Volts) 0.4

Figure 7

One Technology Drive, Suite 325

Andover, MA 01810, USA

Tel: +1 978 738 0900 Fax: +1 978 738 0196

www.memsic.com

Information furnished by MEMSIC is believed to be accurate and reliable. However, no responsibility is assumed by MEMSIC

for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by

implication or otherwise under any patent or patent rights of MEMSIC. Information presented in this document is the property of MEMSIC, Inc.,

is considered proprietary, and is not to be reproduced without the speciﬁc written permission of MEMSIC, Inc.

MXC6225XU -DTOS Accelerometer

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MXC6225XU: Fully Integrated Thermal Accelerometer

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Document Version 1.0 page 6

DTOS Output state response to orientation

If the sensor is rotated past the 45 degree threshold, the orientation bits will change only if the sensor

stays in the same state for a deﬁned period of time. If the sensor crosses back before this time period, the

orientation bits remain unchanged. This is to prevent dithering of the orientation state. Four user

programmable hysteresis time periods are available : 160, 320, 640 and 1280ms.

DTOS Shake Detection

Shake and shake direction are orthogonal to screen orientation. An interrupt pin (INT) is set high and must

be cleared by the MCU via the I2C interface. Four user programmable thresholds are available: 0.5g, 1g,

1.5g and 2g.

Orientation Characteristics

Orientation State Bits OR [1,0]

6 0 5

0 2 8

6 0 5

0 2 8

6 0 5

0 2 8

6 0 5

0 2 8

Off-axis operating range

for orientation

+90 deg-90 deg

-60 deg +60 deg

Y Axis

Ф=0

Region II

OR[1:0]=01

ax= -ay

ax= ay

angle threshold

θ=45 degree

Region I

OR[1:0]=00

Region IV

OR[1:0]=11

Region III

OR[1:0]=10

Orientation Angle Off-Axis Tilt

Front View

Side View

Same Plane DTOS is guaranteed to detect orientation changes with up to 60 degrees of off-axis tilt

Figure 9

Figure 8

Figure 10

Figure 12

Figure 11

One Technology Drive, Suite 325

Andover, MA 01810, USA

Tel: +1 978 738 0900 Fax: +1 978 738 0196

www.memsic.com

Information furnished by MEMSIC is believed to be accurate and reliable. However, no responsibility is assumed by MEMSIC

for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by

implication or otherwise under any patent or patent rights of MEMSIC. Information presented in this document is the property of MEMSIC, Inc.,

is considered proprietary, and is not to be reproduced without the speciﬁc written permission of MEMSIC, Inc.

MXC6225XU -DTOS Accelerometer

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A slave mode I2C interface, capable of operating in standard or fast mode, is implemented on the DTOS.

The interface uses a serial data line (SDA) and a serial clock line (SCL) to achieve bi-directional communi-

cation between master and slave devices. A master (typically a microprocessor) initiates all data transfers

to and from the device, and generates the SCL clock that synchronizes the data transfer. The SDA pin on

the DTOS operates both as an input and an open drain output. Since the DTOS only operates as a slave

device, the SCL pin is always an input. There are external pull-up resistors on the I2C bus lines. Devices

that drive the I2C bus lines do so through open-drain n-channel driver transistors, creating a wired NOR

type arrangement.

Data on SDA is only allowed to change when SCL is low. A hi to low transition on SDA when SCL is hi is

indicative of a START condition, whereas a low to hi transition on SDA when SCL is hi is indicative of a

STOP condition. When the interface is not busy, both SCL and SDA are hi. A data transmission is initiated

by the master pulling SDA low while SCL is hi, generating a START condition. The data transmission

occurs serially in 8 bit bytes, with the MSB transmitted ﬁrst. During each byte of transmitted data, the

master will generate 9 clock pulses. The ﬁrst 8 clock pulses are used to clock the data, the 9th clock pulse

is for the acknowledge bit. After the 8 bits of data are clocked in, the transmitting device releases SDA,

and the receiving device pulls it down so that it is stable low during the entire 9th clock pulse. By doing

this, the receiving device “acknowledges” that it has received the transmitted byte. If the slave receiver

does not generate an acknowledge, then the master device can generate a STOP condition and abort the

transfer. If the master is the receiver in a data transfer, then it must signal the end of data to the slave by

not generating an acknowledge on the last byte that was clocked out of the slave. The slave must release

SDA to allow the master to generate a STOP or repeated START condition.

The master initiates a data transfer by generating a START condition. After a data transmission is com-

plete, the master may terminate the data transfer by generating a STOP condition. The bus is considered

to be free again a certain time after the STOP condition. Alternatively, the master can keep the bus busy

by generating a repeated START condition instead of a STOP condition. This repeated START condition is

functionally identical to a START condition that follows a STOP. Each device that sits on the I2C bus has a

unique 7 bit address.

DTOS I2C Interface

One Technology Drive, Suite 325

Andover, MA 01810, USA

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www.memsic.com

Information furnished by MEMSIC is believed to be accurate and reliable. However, no responsibility is assumed by MEMSIC

for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by

implication or otherwise under any patent or patent rights of MEMSIC. Information presented in this document is the property of MEMSIC, Inc.,

is considered proprietary, and is not to be reproduced without the speciﬁc written permission of MEMSIC, Inc.

MXC6225XU -DTOS Accelerometer

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The ﬁrst byte transmitted by the master following a START is used to address the slave device.

The ﬁrst 7 bits contain the address of the slave device, and the 8th bit is the R/W* bit (read = 1, write = 0;

the asterisk indicates active low, and is used instead of a bar). If the transmitted address matches up to

that of the DTOS, then the DTOS will acknowledge receipt of the address, and prepare to receive or send

data.

If the master is writing to the DTOS, then the next byte that the DTOS receives, following the address

byte, is loaded into the address counter internal to the DTOS. The contents of the address counter indicate

which register on the DTOS is being accessed. If the master now wants to write data to the DTOS, it just

continues to send 8-bit bytes. Each byte of data is latched into the register on the DTOS that the address

counter points to. The address counter is incremented after the transmission of each byte.

If the master wants to read data from the DTOS, it ﬁrst needs to write the address of the register it wants

to begin reading data from to the DTOS address counter. It does this by generating a START, followed by

the address byte containing the DTOS address, with R/W* = 0. The next transmitted byte is then loaded

into the DTOS address counter. Then, the master repeats the START condition and re-transmits the DTOS

address, but this time with the R/W* bit set to 1. During the next transmission period, a byte of data from

the DTOS register that is addressed by the contents of the address counter will be transmitted from the

DTOS to the master. As in the case of the master writing to the DTOS, the contents of the address counter

will be incremented after the transmission of each byte. The protocol for multiple byte reads and writes

between a master and a slave device is depicted in Figure 13.

The I2C address for DTOS is set as 2AH.

Figure 13

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www.memsic.com

Information furnished by MEMSIC is believed to be accurate and reliable. However, no responsibility is assumed by MEMSIC

for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by

implication or otherwise under any patent or patent rights of MEMSIC. Information presented in this document is the property of MEMSIC, Inc.,

is considered proprietary, and is not to be reproduced without the speciﬁc written permission of MEMSIC, Inc.

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The registers available to the user on the DTOS are summarized in the table above.

Each register contains 8 bits.

$00: XOUT – 8-bit x-axis acceleration output (read only)

8-bit x-axis acceleration output. Data in 2’s complement format with range of -128 to +127.

$01: YOUT – 8-bit y-axis acceleration output (read only)

8-bit y-axis acceleration output. Data in 2’s complement format with range of -128 to +127.

$02:STATUS – orientation and shake status register (read only)

User Register Summary

Address Name Deﬁnition Access Contents Stored in OTP Memory

$00 XOUT 8-bit x-axis acceleration

output

read no

$01 YOUT 8-bit y-axis acceleration

output

read no

$02 STATUS orientation and shake

status

read no

$04 DETECTION Power down, orientation

and shake detection

parameters

write no

D7 D6 D5 D4 D3 D2 D1 D0

XOUT[7] XOUT[6] XOUT[5] XOUT[4] XOUT[3] XOUT[2] XOUT[1] XOUT[0]

D7 D6 D5 D4 D3 D2 D1 D0

YOUT[7] YOUT[6] YOUT[5] YOUT[4] YOUT[3] YOUT[2] YOUT[1] YOUT[0]

D7 D6 D5 D4 D3 D2 D1 D0

INT SH[1] SH[0] TILT ORI[1] ORI[0] OR[1] OR[0]

OR[1:0] is a 2-bit indication of the device orientation, according to the following scheme:

OR[1:0] = 00 – device is vertical in upright orientation; 01 – device is rotated 90 degrees clockwise; 10–

device is vertical in inverted orientation; 11 – device is rotated 90 degrees counterclockwise. The bits

OR[1:0] are indicative of “long-term” orientation. The orientation is determined by measuring the signs of

the quantities ax – ay, and ax + ay, as shown in Fig. 10. In addition to these measurements, the orientation

measurement must be validated by requiring that the larger in magnitude of ax, ay be greater than 3/8 g.

In order for a new value of OR[1:0] to be written to the STATUS register, a valid measurement of the new

orientation must be measured a consecutive number of times determined by the setting of bits ORC[1:0] in

the DETECTION register. This provides a low-pass ﬁltering and hysteresis effect that keeps a display from

ﬂickering near orientation boundaries

One Technology Drive, Suite 325

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www.memsic.com

Information furnished by MEMSIC is believed to be accurate and reliable. However, no responsibility is assumed by MEMSIC

for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by

implication or otherwise under any patent or patent rights of MEMSIC. Information presented in this document is the property of MEMSIC, Inc.,

is considered proprietary, and is not to be reproduced without the speciﬁc written permission of MEMSIC, Inc.

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ORI[1:0] is the instantaneous device orientation. It follows the same scheme as OR[1:0], except that it is

updated every time a valid orientation measurement is made, not subject to the same low-pass ﬁltering as

OR[1:0].

TILT is an indication of whether there is enough acceleration signal strength to make a valid orientation

measurement. If TILT = 0, the orientation measurement is valid, if TILT = 1, then the orientation measure-

ment is invalid. TILT is updated every measurement cycle.

SH[1:0] indicate whether a shake event has taken place, and if so, its direction. Shake can only be

detected in a direction perpendicular to the vertical orientation of the device. When an acceleration

perpendicular to the device orientation (ax for OR[1:0] = 01 or 11; ay for OR[1:0] = 00 or 10) is sensed that

has a magnitude greater than the value set by bits SHTH[1:0] in the DETECTION register, then shake detec-

tion begins. For a shake event to be written to SH[1:0], the perpendicular acceleration must again exceed

the magnitude set by SHTH[1:0] but with the opposite sign (if bit SHM = 0 in the DETECTION register), or

just reverse its sign (if bit SHM = 1 in the DETECTION register). The above mentioned second accelera-

tion events must occur within a certain amount of time, set by SHC[1:0] in the DETECTION register, of the

original breaking of the threshold.

If a shake is determined to have occurred, then the direction of the shake can be determined by the signs

of the accelerations. The shake status is indicated as shown in the following table:

INT is the interrupt bit. Setting this bit hi will cause the INT pin to output a hi level. The INT bit will be

set whenever, 1. The orientation, as indicated by bits OR[1:0] changes, or 2. A shake event occurs. The

microprocessor can then service the interrupt by reading the STATUS register. Once a shake event occurs,

no new shake events will be recorded until the interrupt has been serviced, although the orientation bits

will continue to be updated. The INT bit is cleared by a microprocessor read of the STATUS register.

SH[1] SH[0]

0 0 no shake event

0 1 shake left

1 0 shake right

1 1 undeﬁned

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Information furnished by MEMSIC is believed to be accurate and reliable. However, no responsibility is assumed by MEMSIC

for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by

implication or otherwise under any patent or patent rights of MEMSIC. Information presented in this document is the property of MEMSIC, Inc.,

is considered proprietary, and is not to be reproduced without the speciﬁc written permission of MEMSIC, Inc.

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Document Version 1.0 page 11

$04:DETECTION – orientation and shake detection parameters (write only)

PD = 1 powers down the DTOS to a non-functional low power state with a maximum current drain of 1 uA.

ORC[1:0] sets the orientation count, which is the number of consecutive valid new orientation readings

that must be made before a new orientation value is written into bits OR[1:0] in the STATUS register. The

nominal rate at which readings are taken is 100 Hz. The number of consecutive valid orientation measure-

ments required to effect a “long-term” orientation change is set by ORC[1:0] as follows: 00 – 16 readings,

01 – 32 readings, 10 – 64 readings, 11 – 128 readings.

SHC[1:0] sets the shake count, which determines the number of readings allowed between the ﬁrst shake

event (perpendicular acceleration exceeding the threshold set by SHTH[1:0]) and the second shake event

(acceleration breaking the threshold with opposite sign, SHM = 0, or just reversing sign, SHM = 1). The

number of readings is set by SHC[1:0] as follows: 00 – 16 readings, 01 – 32 readings, 10 – 64 readings,

11 – 128 readings.

SHTH[1:0] sets the shake threshold that the perpendicular acceleration must exceed to trigger the ﬁrst

shake event. The settings for SHTH[1:0] are: 00 - 0.5 g, 01 – 1.0 g, 10 – 1.5 g, 11 – 2.0 g.

SHM is the shake mode bit. If SHM = 0, then for a shake to be detected, and written to SH[1:0] in the

STATUS register, the second shake event must break the threshold set by SHTH[1:0] with the opposite

sign of the ﬁrst shake event, within the number of readings set by SHC[1:0]. If SHM = 1, then the second

shake event must just have the opposite sign of the ﬁrst shake event within the number of readings set by

SHC[1:0].

D7 D6 D5 D4 D3 D2 D1 D0

PD SHM SHTH[1] SHTH[0] SHC[1] SHC[0] ORC[1] ORC[0]

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Information furnished by MEMSIC is believed to be accurate and reliable. However, no responsibility is assumed by MEMSIC

for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by

implication or otherwise under any patent or patent rights of MEMSIC. Information presented in this document is the property of MEMSIC, Inc.,

is considered proprietary, and is not to be reproduced without the speciﬁc written permission of MEMSIC, Inc.

MXC6225XU -DTOS Accelerometer

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Document Version 1.0 page 12

Figure 14

Pin 1

Week number in the year

Y= year

0= 2010

Part number stands

for MXC6225XU.

Lot number

Device Marking Illustration