mcs7840 MosChip, mcs7840 Datasheet - Page 4

• Manufacturer Part Number: mcs7840
• Description: Usb-2.0 To Four Serial Ports
• Manufacturer: MosChip

Page 4
MCS7840
USB-2.0 to Four Serial Ports
Pin Assignments
Pin
10
12
13
14
15
16
17
18
19
20
21
22
11
1
2
3
4
5
6
7
8
9
TEST_MODE
USB_XSCO
USB_RREF
USB_XSCI
DSR_4_N
DCD_4_N
DTR_4_N
RTS_4_N
CTS_4_N
DTR_1_N
USB_DM
USB_DP
RI_4_N
RXD_4
TXD_4
TXD_1
Name
GND
GND
GND
Vcc
Vcc
Vcc
A
A
K
K
A
A
Output
Output
Output
Output
Output
Output
Power
Power
Power
Power
Power
Power
Type
Input
Input
Input
Input
Input
Input
Input
Input
I/O
I/O
Core Ground
Crystal Oscillator Input
Crystal Oscillator Output
Power Pin (A3V3)
Analog Ground
External Reference Resistor (12.1 KΩ, 1%)
Connect resistor to Analog GND.
USB D- Signal
USB D+ Signal
Power Pin (A3V3)
Analog Ground
Power Pin (1.8V)
Test Mode Pin, (active high). Default = Low (0)
When TEST_MODE = 1, PLL, Core, and SCAN/BIST/
Memory BIST testing can be performed.
Set TEST_MODE = 0 for normal operation.
Serial Port 4 Transmit Data out to transceiver or IrDA
data out to IR LED
Serial Port 4 Data Terminal Ready (in serial protocol),
active low.
Serial Port 4 Request To Send (in serial protocol),
active low.
Serial Port 4 Serial Receive Data in from transceiver
or IrDA data in from IrDA detector.
Serial Port 4 Ring Indicator, active low
Serial Port 4 Data Set Ready (in serial protocol), active
low
Serial Port 4 Data Carrier Detect (in serial protocol),
active low
Serial Port 4 Clear To Send (in serial protocol), active
low
Serial Port 1 Transmit Data out to transceiver, or IrDA
data out to IR LED
Serial Port 1 Data Terminal Ready (in serial protocol),
active low.
Functional Description
Rev.
1.2