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MCS7780
USB to IrDa Port
Features
• Single 3.3V – 5.0V operation
• Low power
• Full compliance with the USB V1.1 specification and
IrDa 1.3
• IrDa data rates from 2.4Kbps to 4 Mbps
• Uses standard IrDa Transceivers
• Microsoft compatible
• Internal power-on reset
• On-chip oscillator
• Available in 28-pin SSOP package
Applications
• High-speed IrDa Communications
• Cell phone interface cable
Application Note
• AN-7780
Evaluation Board
• MCS7780-EVB
General Description
The MCS7780 controller provides bridging between the
Universal Serial Bus (USB) input and an IrDa wireless
data communication port. This device contains all the
necessary logic to communicate with the host computer
via the USB bus.
In addition, the MCS7780 contains a 3.3V regulator and
operates in bus-powered mode.
The MCS7780 has a reduced frequency (12MHz) crys-
tal oscillator . This combination of features allows signifi-
cant cost savings in system design along with straight
forward implementation of IrDa port functionality into PC
peripherals using the host’s USB port.
Ordering Information
Commercial Grade ( 0° C to +70° C )
MCS7780CS 28-SSOP Standard
MCS7780CS-GR 28-SSOP RoHS
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MCS7780
USB to IrDa Port
MCS7780 Pin assignment
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
N.C.
N.C.
XTAL2
XTAL1
DGND
nRESE
T
N.C.
N.C.
N.C.
N.C.
3.3VA
DP
N.C.
N.C.
T
XDIODEG
TXDIODE
N.C.
N.C.
RXFAST
TX
RXSLOW
SD/MODE
DGND
3.3V
AGND
DM
N.C.
N.C.
MCS7780CS
