MCS7840
USB-2.0 to Four Serial Ports
Rev.
1.2
Page 5
Pin
Name
Type
Functional Description
23
RTS_1_N
Output
Serial Port 1 Request To Send (in serial protocol),
active low.
24
RXD_1
Input
Serial Port 1 Serial Receive Data in from transceiver,
or IrDA data in from IrDA detector.
25
RI_1_N
Input
Serial Port 1 Ring Indicator, active low.
26
Vcc
K
Power
Power Pin (1.8V)
27
GND
K
Power
Core Ground
28
Vcc
3IO
Power
Power Pin (D3V3)
29
DSR_1_N
Input
Serial Port 1 Data Set Ready (in serial protocol), active
low
30
DCD_1_N
Input
Serial Port 1 Data Carrier Detect (in serial protocol),
active low
31
CTS_1_N
Input
Serial Port 1 Clear To Send (in serial protocol), active
low
32
SHTD_1_N
Output
Shut Down External Serial Transceiver during normal
operation, active low by default, can be configured
active high by using DCR setting.
33
REG06_VCC33
Power
Power Pin (3.3V OUTPUT)
34
Vcc
5A
Power
Power Pin (5V INPUT)
35
GND
5A
Power
Ground Pin for 5V Input
36
REG02_V18
Power
Power Pin (1.8V OUTPUT)
37
Vcc
18A_PLL
Power
PLL Power (1.8V)
38
GND
18A_PLL
Power
PLL Ground
39
Vcc
K
Power
Power Pin (1.8V)
40
VCC3IO
Power
Power pin D3V3.
41
GPIO
I/O
GPIO_MODE - Bidirectional GPIO bit. The direction
(Input or Output) is controlled by the DCR for Serial
Port #1.
42
RESET
I
Power-On Reset signal (active high).
43
EE_SCL
I/O
2-Wire EEPROM Clock. Default = High (1)
44
EE_SDA
I/O
2-Wire EEPROM Data in/out. Default = High (1)
45
TXD_2
Output
Serial Port 2 Transmit Data out to transceiver, or IrDA
data out to IR LED
46
DTR_2_N
Output
Serial Port 2 Data Terminal Ready (in serial protocol),
active low.
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