MAX17843 datasheet(36/131 Pages) MAXIM

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AUTOBALSWDIS Feature

This feature enables the automatic disabling of the balanc-

ing switches during measurements. The main purpose

of this feature is to phase out the additional voltage drop

due to cell balancing in accuracy measurements. This

ultimately allows the system to get more precise cell-

voltage readings, which helps to calculate higher accu-

racy of state-of-charge (SoC). The AUTOBALSWDIS bit

is the D11 bit in the DEVCFG1 register. This bit when

set to '1' turns off the balancing switches. A delay in

the AUTOBALSWDIS delay register (0x0C) is selected

based on the DELAYSEL bit in the SCANTCTRL register

(0x13), and the set wait time is added after the scan is

enabled before the start of actual measurements. The

AUTOBALSWDIS delay register has a minimum delay

setting of 96μs, with maximum being up to 24.57ms.

It is divided into two 8-bit time-delay settings, with lower-

byte register-delay setting for cell-recovery time, while

upper byte of the register used for the delay setting of

certain diagnostics such as sense-wire open. This delay

should be set as appropriate by the customer according

to their cell characteristics and properties and to enhance

the maximum SoC of the battery available. Once the

measurement is executed and the Scan done bit is set,

the AUTOBALSWDIS bit should be cleared by the host.

Enabling the AUTOBALSWDIS bit adds a delay before

the start of measurements, but after the scan is enabled;

therefore, this feature can be used during normal cell

measurements as well as during diagnostic measure-

ments with two separate delay timers that can be

independently set.

Figure 14. Logic Diagram when Balancing Switches Are Disabled

THRMSHDN/

BALSWDISABLE/

AUTOBALSWDIS/

EMGCYDCHG/

PRIORITY OF OPERATION

THRMSHDN > EMGCYDCHG > AUTOBALSWDIS/BALSWDISABLE > BALSWENn

BALANCING SWITCH

ENABLE

(BALSWEN)n

RST/

POR

DISABLING OF

BALANCING SWITCHES

MAX17843

12-Channel, High-Voltage Smart Sensor

Data-Acquisition Interface

www.maximintegrated.com

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