BU9817FV-E2 - ROHM Electronics - Datasheet.Directory

BU9817FV

Multimedia ICs

4-channel temperature sensor IC for

PCs with I2C BUS interface

BU9817FV

The BU9817FV is a 4-channel, 8-bit, A / D converter / overvoltage detector that is perfect for temperature sensors with

built-in I2C BUS interfaces. The host can access the BU9817FV anytime for the voltage data.

!Applications

Notebook computers, desktop computers, household

electric appliances

!Features

1) By attaching a thermistor, a maximum four-channel

temperature sensor is possible.

2) Can set comparison voltages independently.

3) Built-in I2C BUS interface.

4) Detection level and operating mode settings are pro-

grammable.

5) Extremely low operating current perfect for portable

equipment.

6) Operating voltage of VDD = 3V to 5.5V.

!

!!

!Absolute maximum ratings (Ta = 25°C)

Parameter Symbol Limits Unit

Power supply voltage

Power dissipation

Operating temperature

Storage temperature

Voltage applied to pins

VDD

Pd

Topr

Tstg

VIN

7.0

350

– 15 ~ + 75

– 55 ~ +125

GND – 0.5 ~ VDD + 0.5

V

mW

˚C

V

* Reduced by 3.5mW for each increase in Ta of 1˚C over 25˚C.

!

!!

!Recommended operating conditions (Ta = 25°C)

Parameter Symbol UnitMax.Typ.Min.

Operating power supply voltage VDD 3.0 5.5—V

Note) I2C BUS is a registered trademark philips.

BU9817FV

Multimedia ICs

!

!!

!Block diagram

I2C BUS Interface

Vdl

Register

Vul

Register

Pointer

Register Configuration

Register

Reset & Shutdown

Reset

Voltage

Hysteresis

Comparator

ADV

Register

Reset

Voltage

Hysteresis

Comparator

ADV

Register

Reset

Voltage

Hysteresis

Comparator

ADV

Register

Reset

Voltage

Hysteresis

Comparator

ADV

Register

8bit

A / D

Reset

Shutdown

Sel

14 VDD

13 STOPB

12

11

10

9

8

AD1

AD2

AD3

AD4

CLK

1

2

3

4

5

6

7

SDA

SCL

OD1

OD2

OD3

OD4

GND

BU9817FV

Multimedia ICs

!

!!

!Pin descriptions

Pin No. Pin name Function

1

2

3

4

5

6

7

8

9

10

11

12

13

14

SDA

SCL

OD1

OD2

OD3

OD4

GND

CLK

AD4

AD3

AD2

AD1

STOPB

VDD

I2C BUS Serial Data Line

I2C BUS Serial Clock Input

Open Drain Output 1

Open Drain Output 2

Open Drain Output 3

Open Drain Output 4

Ground

Clock for Logic Input

Analog-to-Digtal Converter Input 4

Analog-to-Digtal Converter Input 3

Analog-to-Digtal Converter Input 2

Analog-to-Digtal Converter Input 1

Reset & Power save mode set

Supply Voltage 3.0V to 5.5V

BU9817FV

Multimedia ICs

!

!!

!Input / output equivalent circuits

Pin. No Pin name Input / output circuits Function

1

2

7

8

3

4

5

6

SDA

SCL

GND

CLK

OD1

OD2

OD3

OD4

I

2

C BUS serial data input / output.

When only input address accords slave

address (BU9817FV's), register data is

inputted or outputted.

I

2

C BUS serial clock input.

Open-drain output corresponds to AD1 to

AD4 input.

Connect this pin a pull-up resister.

The pull-up resister should be above V

DD

/

4mA (Ω).

Ground terminal.

Clock input for ADC block.

Input clock is 32.768kHz.

AD converter and voltage hysteresis

comparator use this clock to operate.

BU9817FV

Multimedia ICs

!

!!

!Input / output equivalent circuits

Pin. No Pin name Input / output circuits Function

13

14

9

10

11

12

STOPB

VDD

AD1

AD2

AD3

AD4

AD input.

Each channel is converted in order.

(AD1, AD2, AD3, AD4, AD1,AD2...)

Reset and power save mode setting.

High: Operation mode

Operation follows the setting of

configuration register.

Low : Reset & Power save mode

Reset the all internal circuit and stop

the ADC operation.

Go into power save mode.

∗ Be sure to set STOPB pin low for initial

reset of the internal circuit, when the

BU9816FV is power up.

Power supply.

Supply voltage 3.0V to 5.5V.

BU9817FV

Multimedia ICs

!Electrical characteristics (unless otherwise noted, VDD = 5.0V, Ta = 25°C)

Parameter Symbol Min. Typ. Max. Unit Conditions

Circuit current (normal)

Circuit current

(shutdown / reset / STOPB)

Input high level voltage

Input low level voltage

Input high level current

Input low level current

Input capacity

Open drain output

low level voltage

SDA

output low level voltage

SDA

output fall time

STOPB

minimum pulse width

I

CC

I

CC

.sd

V

iH

V

iL

I

iH

I

iL

Ci

VoLod

VoLsda

tfsda

pwstopb

0.2

—

V

DD

× 0.7

– 0.5

—

– 1.0

—

0.0

—

10

0.75

1.0

V

DD

0.0

—

0.2

—

2.0

V

DD

+ 0.5

V

DD

× 0.3

1.0

—

10

0.6

250

—

mA

µA

V

µA

pF

V

ns

µs

SDA, SCL = “H”

CLK = 32.768kHz

SDA, SCL = “H”

CLK = 32.768kHz

Mode setting or

STOPB = Low

—

loL = 4.0mA

loL = 6.0mA

CL = 400pF

loL = 6.0mA

—

〈A / D〉

〈STOPB minimum pulse width〉

AD resolution

Non-linearity error

Differential non-linearity error

1-channel conversion time

Input range

RES

Nle

Ndle

Tc

Ai

—

– 2

– 1

—

GND

8

—

305

—

2

1

—

V

DD

bits

LSB

µs

V

2 points connected

fCLK = 32.768kHz

—

V

DD

0.3V

DD

Minimum pulse width

GND

BU9817FV

Multimedia ICs

!Measurement circuit

AAA

NNNN

V

1.2kΩ

V

1.2kΩ

V

1.2kΩ

V

1.2kΩ

820Ω

I

2

C BUS

Controller

820Ω

A

V

A

820Ω

V

1

2

3

4

5

6

7

14

13

12

11

10

9

8

32.768kHz

Fig.1

BU9817FV

Multimedia ICs

!Circuit operation

Explanation of operating mode

The asterisk can be either 0 or 1.

∗

Conversion time is for fCLK = 32.768kHz.

∗

These mode setting bits (bit 0 and bits 3 to 5) are common for each channel, the last setting of bits (bit0 and bits3 to 5) is

effective for all channels. Furthermore, bits 1 and 2 are independent and can be set for each channel.

∗

Note: These parameters are reference values derived through calculations and are not guaranteed characteristic values.

Operating mode Configuration

register settings ADC operation

conversion interval Open drain

operation timing Register status Current

consumption (typ.)

Normal mode

Interval High mode

Interval Low mode

Shutdown mode

Reset mode

00000

∗∗

0b

00110

∗∗

0b

00100

∗∗

0b

00000

∗∗

1b

00

∗∗

1

∗∗∗

b

1.221ms

1 second intervals

4 second intervals

Stopped

10th clock after

A / D conversion

10th clock after

A / D conversion

10th clock after

A / D conversion

Reset fixed at high

Hold status

Normal operation

Hold data

Data reset

0.75mA

Note: average

less than 3µA

Note: average

less than 2µA

Less than 1µA

Explanation of ADC / open drain operation

(Normal mode)

4ch 1ch 2ch 3ch 4ch 1ch 2ch 3ch 4ch 1ch

Tad = 1.221ms, 40 clock

10 clock

ADC operation

OD1

OD2

OD3

OD4

(Interval mode)

1ch 2ch 3ch 1ch 2ch 3ch4ch 1ch

Tc = 1.831ms, 60 clock

Tin = 1s, 4s

10 clock 10 clock 10 clock

ADC operation

OD1

OD2

OD3

OD4

BU9817FV

Multimedia ICs

!Circuit operation

Explanation of I2C BUS interface

• Slave address

MSB LSB

1001111R / W

Parameter Symbol Min. Max. Unit

SCL clock frequency

Start condition hold time

Start condition setup time

Data setup time

Data hold time

Stop condition setup time

f SCL

t HD: STA

t SU: STA

t SU: DAT

t HD: DAT

t SU: STO

0

0.6

100

0

0.6

400

—

0.9

—

kHz

µs

ns

µs

• Conforms to I

2

C BUS standards

SCL

SDA

SCL

SDA

(Stop conditions)

(Start conditions)

(Data conditions)

SCL

SDA

t SU: STA

t SU: DAT t HD: DAT

t SU: STO

t HD: STA

BU9817FV

Multimedia ICs

!Circuit operation

OD output voltage response diagram

Time

Read Read Read

∗∗∗

Vul

Vdl

OD Output

(Comparator Mode)

OD Output

(Interrupt Mode)

AD pin voltage waveform

(Example: open-drain output is set active low)

* Note: Resetting OD output under interrupt mode occurs at only shutdown mode or reset mode or STOPB or when data

read generated from host. Except for these cases, OD output is kept setting.

BU9817FV

Multimedia ICs

!Circuit operation

Register structure

I

2

C BUS

Interface Pointer

Register

(Register select)

SDA

SCL

1ch Configuration Register

1ch Vdl Register

1ch Vul Register

1ch ADV Register

2ch Configuration Register

2ch Vdl Register

2ch Vul Register

2ch ADV Register

3ch Configuration Register

3ch Vdl Register

3ch Vul Register

3ch ADV Register

4ch Configuration Register

4ch Vdl Register

4ch Vul Register

4ch ADV Register

I2C Bus data structure

(1) Write Mode

S Address W

—AAPointer reg. Byte Write Data Byte A P

(2) Read Mode

1) Pointer register set

S Address W

—

A

—

AAPointer reg. Byte

Sr Address ARPRead Data Byte

2) Preset pointer register

S Address A

—

ARPRead Data Byte

S: Start condition

P: Stop condition

Sr: Restart condition

A: acknowledge

A: acknowledge bar

—

BU9817FV

Multimedia ICs

Mode settings table 1 / 2

(1) Pointer register (selects which registers will be read from or written to)

D7 D6

00

D5

0

D4

0

D3

D3 D2 Channel

0

1

0

1

0

1

Channel 1

Channel 2

Channel 3

Channel 4

Channel Select

D2 D1

Register Select

D0

D4 to D7: These bits are used for test mode and must be kept zero for normal operation.

Channel Select

Register Select

D1 D0 Register

0

1

0

1

0

1

ADV Register (Read only) (Power on Reset default)

Configuration Register (Read / Write)

Vdl Register (Read / Write)

Vul Register (Read / Write)

(2) ADV Register (Read only)

Channel D7 D6 D5 D4 D3 D2 D1 D0

MSB

bit6

bit5

bit4

bit3

bit2

bit1

LSB

1 ch

2 ch

3 ch

4 ch

D0 to D7: Voltage data

The defaults for the power-on-reset and reset modes are 1 for all bits.

(3) Configuration Register (Read / Write)

Channel D7 D6 D5 D4 D3 D2 D1 D0

1 ch

2 ch

3 ch

4 ch

The defaults for the power-on-reset and reset modes are 0 for all bits.

0

Comp. / Int.

Interval

Mode Interval

Speed Reset Shutdown

Opendrain

Polarity

Opendrain

Polarity

Opendrain

Polarity

Opendrain

Polarity

BU9817FV

Multimedia ICs

Mode settings table 2 / 2

D0 : Shutdown

“0” - Operation mode.

“1” - The BU9817FV stops A / D operation and goes into low power shutdown mode.

D0 bit of each channel is common bit.

D1 : Comparator / Interrupt mode

“0” - Comparator mode.

“1” - Interrupt mode.

D2 : Open Drain Polarity

“0” - active low.

“1” - active high.

D3 : Reset

“0” - Operation mode.

“1” - Reset any bits except D3 bit of the configuration register, any registers, the A / D converter, and the

voltage hysteresis comparator.

D3 bit of each channel is common bit.

D4 : Interval Speed

Set the conversion cycle time of the 8bit A / D and the voltage hysteresis comparator when D5 bit (Interval

Mode) is “1”.

“0” - conversion cycle time is 4s.

“1” - conversion cycle time is 1s.

D4 bit of each channel is common bit.

D5 : Interval Mode

“0” - normal mode.

“1” - Interval mode.

D5 bit of each channel is common bit.

(4) Vul and Vdl Register (Read / Write)

Channel D7 D6 D5 D4 D3 D2 D1 D0

MSB

bit6

bit5

bit4

bit3

bit2

bit1

LSB

1 ch

2 ch

3 ch

4 ch

D0 to D7: Voltage limit data of Vul and Vdl.

Default after power on reset and reset mode is Vul = 80h, Vdl = 66h.

BU9817FV

Multimedia ICs

!

!!

!Application example

Thermal Zone

RTH

V

DD

SDA

SCL

RS

AD1 Input

Thermal Zone

RTH

V

DD

RS

AD2 Input

OD1 Output

OD2 Output

OD3 Output

OD4 Output

AD3 Input

AD4 Input

CLK Input (fCLK = 32.768kHz)

RTH: NTC Thermistor

From system

controller

1

2

3

4

5

6

14

V

DD

13

12

11

10

9

78

STOPB Input (From Reset IC)

Power on Reset

Fig.2

BU9817FV

Multimedia ICs

!

!!

!Explanation for external components

(1) AD input pin (example when used as a temperature sensor)

To the AD input pin, input a voltage with divided resistance from a resistor and NTC thermistor. For the sensor to

measure the temperature, the NTC thermistor is used. The thermistor is a p-type semiconductor and as the temperature

increases, the resistance value becomes lower. In other words, the resistance temperature coefficient is negative,

and so the AD input pin voltage temperature characteristics are also negative.

V

CC

ADx

BU9817FV

Put nearby BU9817FV

Put nearby measured object

GND is required common and stability.

NTC thermistor

!

!!

!External dimensions (Units : mm)

SSOP-B14

0.1

0.22 ± 0.1

0.65

8

7

14

1

6.4 ± 0.3

4.4 ± 0.2

5.0 ± 0.2

1.15 ± 0.1

0.15 ± 0.1

0.3Min.

0.1

Appendix

Appendix1-Rev1.0

The products listed in this document are designed to be used with ordinary electronic equipment or devices

(such as audio visual equipment, office-automation equipment, communications devices, electrical

appliances and electronic toys).

Should you intend to use these products with equipment or devices which require an extremely high level of

reliability and the malfunction of with would directly endanger human life (such as medical instruments,

transportation equipment, aerospace machinery, nuclear-reactor controllers, fuel controllers and other

safety devices), please be sure to consult with our sales representative in advance.

Notes

No technical content pages of this document may be reproduced in any form or transmitted by any

means without prior permission of ROHM CO.,LTD.

The contents described herein are subject to change without notice. The specifications for the

product described in this document are for reference only. Upon actual use, therefore, please request

that specifications to be separately delivered.

Application circuit diagrams and circuit constants contained herein are shown as examples of standard

use and operation. Please pay careful attention to the peripheral conditions when designing circuits

and deciding upon circuit constants in the set.

Any data, including, but not limited to application circuit diagrams information, described herein

are intended only as illustrations of such devices and not as the specifications for such devices. ROHM

CO.,LTD. disclaims any warranty that any use of such devices shall be free from infringement of any

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ROHM CO., LTD. is granted to any such buyer.

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