ADBMS2950BCCSZ datasheet(91/97 Pages) AD

91 / 97 page

Data Sheet

ADBMS2950B

Rev. 0 | Page 91 of 97

Figure 79. VxADC Filter Transfer Function

If required, the host can synchronize a VxADC measurement to

the IxADC and VBxADC through alignment of the ADV and

ADIx commands as shown in Figure 80. As the I1ADC and

VB1ADC are recommended to operate continuously to provide

back-to-back conversion results for better filtering and precise

coulomb counting, single-shot battery current, and voltage

measurements must be performed with the second channel

through ADI2. Alternatively, it is always possible to perform

single-shot measurements on the VxADC only and read

synchronous I1ADC and VxADC conversion results. The

following sequence shows the reading of the 1 ms conversion

result of the continuously operating I1ADC that is acquired

closest to the time when the ADV command is sent.

At time t = 0:

•

SNAP

•

ADV

•

RDI or RDIVB1 to get I1

•

RDFLAG to get I1CNTPHA

•

UNSNAP

At time t = 1 ms:

•

SNAP

•

RDI or RDIVB1 to get I1

•

RDFLAG to get I1CNTPHA

•

UNSNAP

Using the information from I1CNTPHA, the host controller can

decide which I1ADC conversion is acquired closest to the

VxADC measurement.

Figure 80. Command Timing Sequence to Synchronize I2ADC and VxADC

Measurements

Figure 81 shows the transfer function of averaging multiple

single-shot conversions over a longer time window. The

example assumes that the host measures a channel once every

5 ms and calculates the average of 20 samples leading to the

average of the last 100 ms. The multi-measurement of all

channels can be done within 2.39 ms, see Table 58, so that it is

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