PIN DESCRIPTION
DS2745 Low-Cost I2C Battery Monitor
PIN
SYMBOL
FUNCTION
Serial Clock Input. 2-Wire clock line. Input only. Connect this pin to the CLOCK
1
SCL
terminal of the battery pack. Pin has an internal pulldown (IPD) for sensing
disconnection.
Serial Data Input/Output. 2-Wire data line. Open-drain output driver. Connect this pin
2
SDA
to the DATA terminal of the battery pack. Pin has an internal pulldown (IPD) for sensing
disconnection.
3
PIO
General Purpose Input/Output. Open-drain output driver with input sense. Connect
to a pull up resistor for bidirectional operation.
4
SNS
Sense Resistor Connection. Connect to the negative terminal of the battery pack.
Connect the sense resistor between VSS and SNS.
5
VSS
Device Ground. Connect to the negative terminal of the Li+ cell outside the cell
protection FETs. Connect the sense resistor between VSS and SNS.
6
CTG
Connect to Ground. Connect to the negative terminal of the Li+ cell outside the cell
protection FETs.
7
VIN
Voltage Sense Input. The voltage of the Li+ cell is monitored through this input pin.
8
VDD
Power-Supply Input. Connect to the positive terminal of the Li+ cell through a
decoupling network.
Figure 2. BLOCK DIAGRAM
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