Rainbow Electronics DS2710 - Manual (Page 4)

DS2710
Single-Cell NiMH Charger
4 _______________________________________________________________________________________
Pin Description
PIN NAME FUNCTION
1 V SS Device Ground. Connects directly to the negative terminal of the charge source.
2 CS Charge Source. Feedback control for switching circuitry.
3 V DD
Power-Supply Input. Connects to the positive terminal of the charge source through a decoupling
network.
4 THM Thermistor Input. Connects to a thermistor located near the cell and a resistor-divider from the V DD pin.
5 STATUS Status Output. Drives an external LED or microprocessor input to indicate charge status.
6 CTEST Impedance Test. Connects to V SS through an external resistor to set the impedance-test threshold.
7 TMR Fast-Charge Timer. Connects to V SS through an external resistor to set the fast-charge timeout period.
8 VN0 Current-Sense Negative Input. Connects to the charge source side of the external sense resistor.
9 VN1 Current-Sense Positive Input. Connects to the cell side of the external sense resistor.
10 VP1 Cell Voltage Sense. The voltage of the cell is monitored through this input pin.
— EP Exposed Pad. Connects to V SS .
DS2710
BIAS
OSCILLATOR
WATCHDOG
ABORT
VP1
I
PTST
UVLO
3.5V
V DD
STATUS
CTEST
STATUS
MAINTENANCE CHARGE
TOP-OFF CHARGE
SUSPEND
PRECHARGE
PRESENSE TEST
STATE MACHINE
FAST-CHARGE AND
CELL TESTS
VOLTAGE
AND
TEMPERATURE
MEASUREMENT
DUTY-
FACTOR
CONTROL
VN1
THM
CS
0.125V
0.1 μA
V
SS
VN0
CELL
TEST
TMR
CHARGE
TIMER
Figure 1. Block Diagram