Rainbow-electronics DS2778 Bedienungsanleitung PDF herunterladen (Seite 7)

DS2775/DS2776/DS2777/DS2778

2-Cell, Stand-Alone, Li+ Fuel-Gauge IC with

Protector and Optional SHA-1 Authentication

_______________________________________________________________________________________

CURRENT MEASUREMENT

ACCURACY

DS2775/6/7/8 toc07

SNS

(mV)

ACCURACY (μV)

0.0480.0280.008-0.012-0.032

-75

-25

125

-125

-0.052

+70°C

-20°C

+25°C

vs. V

DS2775/6/7/8 toc08

(V)

(mA)

54321

1kΩ RESISTOR FROM PLS TO PK+

CURRENT MEASUREMENT OFFSET

vs. TEMPERATURE

DS2775/6/7/8 toc09

TEMPERATURE (°C)

LSB (1.5625μV)

6040200

-4

-3

-2

-1

-5

-20

Typical Operating Characteristics (continued)

= +25°C, unless otherwise noted.)

Pin Description

PIN NAME FUNCTION

1 CC Charge Control. Charge FET control output.

2 V

Chip-Supply Input. Bypass with 0.1μF to V

3 DC Discharge Control. Discharge FET control output.

4 V

IN2

Battery Voltage Sense Input 2. Connect to highest voltage potential positive cell terminal through

decoupling network.

5 V

IN1

Battery Voltage Sense Input 1. Connect to lowest voltage potential positive cell terminal through

decoupling network.

6 VB Regulated Operating Voltage. Bypass with 0.1μF to V

7 V

Device Ground. Chip ground and battery-side sense resistor input.

8 SNS Sense Resistor Connection. Pack-side sense resistor sense input.

9 PIO Programmable I/O. Can be configured as wake input.

10 PLS

Pack Plus Terminal Sense Input. Used to detect the removal of short-circuit, discharge overcurrent, and

charge overcurrent conditions.

11 SDA/DQ

Data Input/Output. Serial data I/O, includes weak pulldown to detect system disconnect and can be

configured as wake input for 1-Wire devices.

12 SCL/OVD

Serial Clock Input/Overdrive Select. Communication clock for 2-wire devices/overdrive select pin for

1-Wire devices.

13 SRC Protection MOSFET Source Connection. Used as a reference for the charge pump.

14 CP Charge Pump Output. Generates gate drive voltage for protection FETs. Bypass with 0.47μF to SRC.

— EP Exposed Pad. Connect to ground or no connection.

1 2 3 4 5 6 7 8 9 10 11 12 ... 44 45

DS2775/DS2776/DS2777/DS2778 1

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