ds2710 Maxim Integrated Products, Inc., ds2710 Datasheet - Page 4

• Manufacturer Part Number: ds2710
• Description: Single-cell Nimh Charger
• Manufacturer: Maxim Integrated Products, Inc.

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