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BALSW Open Diagnostics

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

verifies that each enabled balancing switch is conducting

(not open) as follows:

● Configures acquisition for bipolar mode (for measur-

ing voltages near zero) automatically

● Configures acquisition for ALTMUX path automati-

cally

● Configures acquisition to measure switch voltages for

those switches enabled by BALSWEN automatically

● Host initiates acquisition

● Compares measurement to the threshold value

BALLOWTHR and BALHIGHTHR (Table 36) auto-

matically

● If outside the threshold, set the corresponding flag in

ALRTBALSW automatically

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 Table 35 for BALSW Short-Diagnostic Auto-

configuration, Table 36 for BALSW Diagnostics. See

Table 37 for BALSW Open-Diagnostic Autoconfguration

and Figure 44 for BALSW Open Diagnostics.

Even/Odd Sense Wire Open Diagnostics

If enabled, the sense-wire open diagnostic modes detect

if a cell-sense wire is disconnected as follows:

● Closes nonadjacent switches (even or odd

automatically)

● Configures acquisition to use ALTMUX path

automatically

● Host waits 100µs for settling and then initiates the

acquisition

● Compares the result to the BALHIGHTHR and

BALLOWTHR registers automatically

● If outside thresholds, sets flags in ALRTBALSW

automatically

See Figure 45 for Cell Sense-Wire Open Diagnostics.

Table 35. BALSW Short Diagnostic Autoconfiguration

Table 36. BALSW Diagnostics

Table 37. BALSW Open-Diagnostic Autoconfiguration

CONFIGURATION BITS

AUTOMATIC SETTING

PURPOSE

MEASUREEN[14:12]

0b000

Disable AUXIN and VBLKP measurements

BALSWEN[11:0]

000h

Disable all balancing switches

DIAGCFG.ALTMUXSEL

Enable ALTMUX measurement path

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

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

MAX17843

12-Channel, High-Voltage Smart Sensor

Data-Acquisition Interface

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