MAX17843 datasheet(78/131 Pages) MAXIM

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HVMUX Switch Shorted Diagnostic

A shorted mux switch is detectable in two ways based on

corrupted measurement values. First, the ALTREF diag-

nostic reports a large error. Also, during normal cell mea-

surements, a shorted HVMUX switch causes the LSAMP

to saturate, which is also easily detectable

HVMUX Test Source Diagnostic

The two current sources attached to the HVMUX even

bus and the HVMUX odd bus can be enabled indepen-

dently instead of as a pair setting the MUXDIAGPAIR

bit. MUXDIAGBUS controls which source is enabled

(MUXDIAGBUS = 1 for odd bus source). This causes every

measurement to have a definable change as the sources

are enabled and disabled. By taking measurements while

alternating which current source is enabled, it is possible to

verify that each current source is working.

See Table 42 for HVMUX switch open diagnstics and Table

43 for HVMUX test-source diagnostic.

Note: NC = No change.

Note: I = Test source current, R = HVMUX resistance.

Table 42. HVMUX Switch Open Diagnostic

Table 43. HVMUX Test-Source Diagnostic

HVMUX SWITCH OPEN FAULT LOCATION

C10

C11

C12

Cell1

Cell2

Cell3

Cell4

Cell5

Cell6

Cell7

Cell8

Cell9

Cell10

Cell11

Cell12

HVMUX TEST-

SOURCE FAULT

EVEN TEST SOURCE

SHORTED TO HV

EVEN TEST SOURCE

OPEN CIRCUIT

ODD TEST SOURCE

SHORTED TO HV

ODD TEST SOURCE

OPEN CIRCUIT

Cell1:

-I x R

I x R

Cell2:

I x R

-I x R

Cell3:

-I x R

I x R

Cell4:

I x R

-I x R

Cell5:

-I x R

I x R

Cell6:

I x R

-I x R

Cell7:

-I x R

I x R

Cell8:

I x R

-I x R

Cell9:

-I x R

I x R

Cell10:

I x R

-I x R

Cell11:

-I x R

I x R

Cell12:

I x R

-I x R

MAX17843

12-Channel, High-Voltage Smart Sensor

Data-Acquisition Interface

www.maximintegrated.com

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