Detailed pin description – Rainbow Electronics DS2715 User Manual

Page 4

DS2715: NiMH Cell Pack Charge Controller

4 of 12

Note 1:

Voltages relative to V

Note 2:

Does not include current through V

, R

, and DIV pins.

Note 3:

Below this voltage no I/O pins are active.

Note 4:

Does not include tolerance of R

resistor.

Note 5:

BIAS

and resistor tolerances must be added to determine actual threshold.

Note 6:

Specified temperature thresholds are only valid if recommended thermistor types are used.

Note 7:

Specification is guaranteed by design.

DETAILED PIN DESCRIPTION

PIN

NAME

DESCRIPTION

1 C

BIAS

Bypass for Internal Voltage Regulator

2 V

Cell Stack Charge Control Output

3 V

Ground Reference and Chip Supply Return

4 LED1

Charging

Indicator

Output

5 LED2

Done

Indicator

Output

6 V

Ground Reference and Chip Supply Return

CTG

Connect to Ground

CTG

Connect to Ground

9 MODE

Mode Select. Connect to V

for linear mode of operation or C

BIAS

for comparator

mode of operation.

10 DIV

Thermistor Divider. Stable output to form a resistor divider for measuring
temperature on THM.

SNS+

Positive Current Sense. Connect to the pack side of the sense resistor.

SNS-

Negative Current Sense. Connect to the cell stack side of the sense resistor.

13 V

Chip Supply Input: +4.0V to +5.5V range.

14 R

Failsafe Timeout. Timeout is selected by an external resistor from R

to V

15 THM

Thermistor Input. Connect to a thermistor located in the cell pack and a divider
resistor from the Div pin.

16 V

BATT

Battery Voltage Sense Input. Connect to a divider from the positive terminal of the
cell stack to measure the voltage of a single cell.