MAX17843 datasheet(82/131 Pages) MAXIM

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Cell Undervoltage Diagnostic

Turning on the balancing switch can be used to generate

a near-zero voltage at any input channel to the ALTMUX

path. By successfully measuring this near-zero voltage,

the diagnostic verifies the lower-end of the input range

and the undervoltage alert function.

Input range can also be verified by using the cell-test

sources to induce a lower cell-channel voltage. If the

change is as expected, it shows that the system can mea-

sure voltages below the present nominal input voltage.

ALRTHVUV Comparator Diagnostic

The ALRTHVUV comparator functionality can be verified by

setting the CPEN bit (to disable the HV charge pump) and

then discharging the external HV capacitor by performing

an acquisition for 5ms (such as 12 cells, 32 oversamples),

or by enabling using one or more of the cell-test current

sources for an appropriate amount of time. The ALRTHVUV

bit should be set after the voltage has decayed.

HVMUX Sequencer Diagnostic

The HVMUX control sequence can be checked using the

sources attached to the Cn pins. The sources are con-

trolled by the CTSTEN bits of the CTSTCFG register. The

basic test method is as follows:

1) Perform an acquisition

2) Turn on a cell-test source

3) Wait for sufficient settling time

4) Perform an acquisition

5) Check that the cell(s) sharing the pin whose current

source was turned on had the expected measure-

ment change and other cells had no changes.

6) Repeat steps 1–5 for other pins to confirm there are

no logic errors in the HVMUX control sequencer.

The cell-test sources can be turned on for individual pins

to create a detectable measurement variation that is deter-

mined by the current-source value and the series resis-

tance of the cell input-filter circuit. The settling time needed

for a certain change in measurement value depends on

the size of the external filter capacitors and the amplitude

of the test-current source. A longer settling time gives the

full voltage change, while a shorter settling time saves test

time and should still produce an easily detectable voltage

difference. By detecting the expected measurement varia-

tion for a given cell input pair and running a sequence of

tests to cover all cases, the HVMUX sequencer operation

is verified.

Figure 53. HVMUX Sequencer Diagnostic

Cn-1

RFILTER

RHVMUX

CELL n

LSAMP

ADC

VAA

AGND

TEST SOURCE

AGND

TEST SOURCES

CONTROLLED BY:

CTSTENn

CTSTSRC

CTSTDAC

RHVMUX

VAA

AGND

RFILTER

TEST SOURCE

MAX17843

12-Channel, High-Voltage Smart Sensor

Data-Acquisition Interface

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