MAX17843 datasheet(75/131 Pages) MAXIM

75 / 131 page

Diagnostic Test Sources

Diagnostic test current sources (see Figure 47) can be

enabled prior to the acquisition mode for detecting both

internal and external hardware faults in the measure-

ment path. One set of test sources are connected to the

HVMUX input side and another set are connected to the

HVMUX output side. See Table 40 for HVMUX output

assignments. The basic premise in these diagnostics

is that for a symmetrical measurement channel with no

faults, the test currents can be applied symmetrically to

the differential channel and there should be almost no

change in the channel measurement. On the other hand,

if an asymmetric fault exists on the channel, the resulting

change will indicate the nature of the fault (e.g., an open

or shorted pin).

For the 15 test current sources on the input channels (13

Cn and two AUXINn):

● The test currents individually enabled per

CTSTEN[12:0] and AUXINTSTEN[2:1].

● The test current ranges from 6.25μA up to 100μA per

CTSTDAC[3:0] (applies to all enabled sources).

● Test current sources from VAA or sinks to AGND

per the CTSTSRC bit, except for C0 (applies to all

enabled sources). The test current sources from VAA

only for CTST0.

For the two test current sources on the HVMUX output

side:

● The test currents are enabled by the MUXDIAGEN

bit.

● The test current always sources from the HV supply.

● The test current ranges from 3.125μA up to 50μA per

CTSTDAC[3:0] (applies to all enabled sources).

● The test current, by default, is applied to both

HVMUX outputs (even and odd outputs). However,

if MUXDIAGPAIR is set, the test current is applied to

only one of the output lines per MUXDIAGBUS. This

mode is used to test the test sources themselves.

See Figure 47 for test current sources diagram.

Table 40. HVMUX Output Assignment

INPUT SIGNAL

HVMUX OUTPUT

C12

Even bus

C11

Odd bus

C10

Even bus

Odd bus

Even bus

Odd bus

Even bus

Odd bus

Even bus

Odd bus

Even bus

Odd bus

Even bus

REF

Odd bus

ALTREF

Odd bus

AGND

Even bus

MAX17843

12-Channel, High-Voltage Smart Sensor

Data-Acquisition Interface

www.maximintegrated.com

Maxim Integrated │ 75

MAX17843 Arkusz danych(PDF) 75 Page - Maxim Integrated Products

MAX17843 Arkusz danych(HTML) 75 Page - Maxim Integrated Products

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Arkusz danych Pobierz

Link URL