ADBMS2950BCCSZ datasheet(40/97 Pages) AD

40 / 97 page

ADBMS2950B

Data Sheet

Rev. 0 | Page 40 of 97

BYTE

BIT 7

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

V7A[15:8]

V8A[7:0]

V8A[15:8]

V9B[7:0]

V9B[15:8]

V10B[7:0]

V10B[15:8]

Table 56. RDALLX Return Values

BYTE

BIT 7

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

VREF2A[7:0]

VREF2A[15:8]

VREF2B[7:0]

VREF2B[15:8]

VREF1P25[7:0]

VREF1P25[15:8]

TMP1[7:0]

TMP1[15:8]

VREG[7:0]

VREG[15:8]

VDD[7:0]

VDD[15:8]

VDIG[7:0]

VDIG[15:8]

EPAD[7:0]

EPAD[15:8]

VDIV[7:0]

VDIV[15:8]

TMP2[7:0]

TMP2[15:8]

After receiving an ADV command, the ADBMS2950B can

either perform a single channel measurement, or sequentially

cycle through several measurement inputs depending on the

VCH parameter. The multiplexer inputs are listed in Table 57

and Table 58, where MUXP indicates the positive multiplexer

input and MUXN indicates the negative multiplexer input.

While V1 to V6 can be measured redundantly by both voltage

ADCs, V7-V10 can only be measured by either V1ADC (V7,

V8) or V2ADC (V9, V10). This enables truly redundant

measurements if V7, V9 or V8, V10 are utilized as pairs, where

the comparison can be done in the host controller.

The ADBMS2950B allows all of its V1 to V10 voltage inputs,

each to be measured against either SGND or VREF1P25.

Furthermore, V1 and V2 can also be measured against either

V3 or V4 to allow differential measurements between two input

pins. The reference potential that is applied per input pin is

selected by corresponding VSx bits (VS1[1:0], VS2[1:0], VS3 to

VS10) in the CFGA Configuration Register (see Table 70).

Table 57. V1ADC and V2ADC Single-Channel Options

VCH

V1ADC MUXP

V2ADC MUXP

V1ADC MUXN

V2ADC

MUXN

V1ADC Results

V2ADC Results

Time

By VS1

V1A

V1B

0.27 ms

By VS2

V2A

V2B

0.27 ms

By VS3

V3A

V3B

0.27 ms

By VS4

V4A

V4B

0.27 ms

By VS5

V5A

V5B

0.27 ms

By VS6

V6A

V6B

0.27 ms

By VS7

By VS9

V7A

V9B

0.27 ms

V10

By VS8

By VS10

V8A

V10B

0.27 ms

VREF2

SGND

VREF2A

VREF2B

0.27 ms

The time of a single channel measurement consists of the

multiplexer setting and a conversion time which is 0.265 ms.

Additionally, to enable external signals to settle before the

measurement is taken, the ADBMS2950B features a

programmable SOAK time. It can be specified in the CFGA

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