MAX1660EEE Просмотр технического описания (PDF) - Maxim Integrated

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MAX1660EEE

Digitally Controlled Fuel-Gauge Interface

Maxim Integrated 

Digitally Controlled

Fuel-Gauge Interface

______________________________________________________________Pin Description

PIN NAME

FUNCTION

Open-Drain Host-Interrupt Output. INT sinks current when active, otherwise high-impedance (see INT

1

INT

Output section). INT is compatible with the SMBus SMBALERT# (the “#” indicates asserted low) signal.

Connect a 100kΩ pullup resistor between INT and VL. Leave INT unconnected if host interrupt is not used.

2

SHDN Active-Low Shutdown Input (see Shutdown Modes section)

3

N.C. No Connection. Not internally connected.

4

CS

Current-Sense Resistor Input

5

AGND Analog Ground

6

REF

2.00V Reference Output. Bypass REF to AGND with a 10nF capacitor (see Internal Regulator and Reference

section).

7

ODI

Discharge Overcurrent-Detection Input (see Overcurrent Detection section)

8

OCI

Charge Overcurrent-Detection Input (see Overcurrent Detection section)

9

GND Ground

10

VL

3.3V Linear-Regulator Output. Bypass VL with a 0.33µF capacitor to GND (see Internal Regulator and

Reference section).

11

BATT Supply Input

12

ODO

High-Voltage, Open-Drain MOSFET Gate-Driver Output. ODO controls activation of the battery-discharge

path (see OCO and ODO Gate Drivers section).

13

OCO

High-Voltage, Open-Drain MOSFET Gate-Driver Output. OCO controls activation of the battery-charge path

(see OCO and ODO Gate Drivers section).

14

RST

Active-Low Reset Output. Connect a 100kΩ pullup resistor between RST and VL. Leave RST unconnected if

the power-on reset function is not used (see RST Output section).

15

SDA

Serial-Data Input/Output. Connect a 10kΩ resistor between SDA and VL (see SMBus Interface section).

16

SCL

Serial-Clock Input. Connect a 10kΩ resistor between SDA and VL (see SMBus Interface section).

_______________Detailed Description

The MAX1660 measures the cumulative charge into

(charging) and out of (discharging) the system battery

pack and stores the information in one of two internal,

independent charge and discharge counters. It

achieves battery-pack overcharge and overdischarge

protection through a powerful digital compare function

that interrupts the host CPU when the charge or dis-

charge counter reaches a host-programmed value. The

device also informs the host of changes in the direction

of current flow and protects the battery pack from

short-circuit and overcurrent conditions.

The MAX1660 incorporates a 2-wire SMBus-compliant

serial interface, allowing access to charge/discharge

counters and internal registers. An optional third wire

provides an SMBALERT#-compliant interrupt signal, or it

may be used as a simple, stand-alone host interrupt.

Coulomb-Counting Interface

The MAX1660’s Coulomb-counting interface monitors

the charge flowing in either the charging or discharging

direction, and counts the Coulombs of charge by incre-

menting either the charge counter (CHGCOUNT) or the

discharge counter (DISCOUNT) accordingly. The num-

ber of counter increments generated per Coulomb of

charge sensed (conversion gain) is given by the follow-

ing equation:

AC = 416.7 x 10 3 RCS Counts

Coulomb

where RCS is the current-sense resistor (see the Typical

Operating Circuit). The gain factor is the constant of

proportionality that relates the counter values stored in

CHGCOUNT and DISCOUNT to the amount of charge

flow into or out of the battery pack. A higher conversion

gain (larger RCS) increases resolution at low currents,

*P.

_______________________________________________________________________________________________________ 7

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