DS2715Z datasheet(4/12 Pages) DALLAS

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DS2715: NiMH Cell Pack Charge Controller

4 of 12

Note 1:

Voltages relative to VSS.

Note 2:

Does not include current through VCH, RT, and DIV pins.

Note 3:

Below this voltage no I/O pins are active.

Note 4:

Does not include tolerance of RT resistor.

Note 5:

VBIAS 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

NAME

DESCRIPTION

CBIAS

Bypass for Internal Voltage Regulator

VCH

Cell Stack Charge Control Output

VSS

Ground Reference and Chip Supply Return

LED1

Charging Indicator Output

LED2

Done Indicator Output

VSS

Ground Reference and Chip Supply Return

CTG

Connect to Ground

CTG

Connect to Ground

MODE

Mode Select. Connect to VSS for linear mode of operation or CBIAS for comparator

mode of operation.

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.

VDD

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

Failsafe Timeout. Timeout is selected by an external resistor from RT to VSS.

THM

Thermistor Input. Connect to a thermistor located in the cell pack and a divider

resistor from the Div pin.

VBATT

Battery Voltage Sense Input. Connect to a divider from the positive terminal of the

cell stack to measure the voltage of a single cell.

DS2715Z Datasheet(PDF) 4 Page - Dallas Semiconductor

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