MAX17823H datasheet(64/129 Pages) MAXIM

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BALSW Open Diagnostic

The BALSW open diagnostic (BALSWDIAG[2:0] = 0b010)

verifies that each enabled balancing switch is conducting

(not open) as follows:

● Automatically configures acquisition for bipolar mode

(for measuring voltages near zero)

● Automatically configures acquisition for ALTMUX path

● Automatically configures acquisition to measure switch

voltages for those switches enabled by BALSWEN

● Host initiates acquisition

● Automatically compares measurement to the thresh-

old value BALLOWTHR and BALHIGHTHR (Table 32)

● If outside the threshold, automatically sets the corre-

sponding flag in ALRTBALSW

Set the thresholds by taking into account the minimum

and maximum RSW of the switch itself, as specified in the

Electrical Characteristics table and the balancing current

for the application. See Figure 39 and Table 33.

Table 33. BALSW Open-Diagnostic Auto Configuration

Table 32. BALSW Diagnostics

CONFIGURATION BITS

AUTOMATIC SETTING

PURPOSE

MEASUREEN[14:12]

0b000

Disable AUXINn and VBLKP measurements

MEASUREEN[11:0]

BALSWEN[11:0]

Measure only active switch positions

DIAGCFG.ALTMUXSEL

Enable ALTMUX measurement path

SCANCTRL.POLARITY

Enable bipolar mode

BALSW

VSWn

FAULT INDICATED?

POSSIBLE FAULT CONDITION

> V(BALHIGHTHR)

Yes

Switch open circuit, or overcurrent

> V(BALLOWTHR)

None

< V(BALHIGHTHR)

< V(BALLOWTHR)

Yes

Path open circuit or short circuit

Off

> V(BALSHRTTHR)

None

< V(BALSHRTTHR)

Yes

Short circuit or leakage current

MAX17823H

12-Channel, High-Voltage

Data-Acquisition Systems

www.maximintegrated.com

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MAX17823H Datasheet(PDF) 64 Page - Maxim Integrated Products

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