MAX17823B datasheet(73/121 Pages) MAXIM

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MAX17823B

12-Channel High-Voltage Data Acquisition System

www.maximintegrated.com

Maxim Integrated | 73

Table 39. HVMUX Switch Pin Open Diagnostic

HVMUX Switch Open Fault Location

C10

C11

C12

Cell1

Cell2

Cell3

Cell4

Cell5

Cell6

Cell7

Cell8

Cell9

Cell10

Cell11

Cell12

Note: NC = no change.

HVMUX Switch Shorted Diagnostic

A shorted mux switch is detectable in two ways based on corrupted measurement values. First, the ALTREF

diagnostic will report a large error. Also, during normal cell measurements, a shorted HVMUX switch will cause 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 may be enabled independently

instead of as a pair setting the MUXDIAGPAIR bit. MUXDIAGBUS controls which source is enabled (MUXDIAGBUS

= 1 for odd bus source). This will cause 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.

Table 40. HVMUX Test Source Diagnostic

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

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

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