ADBMS2950BCCSZ datasheet(21/97 Pages) AD

21 / 97 page

Data Sheet

ADBMS2950B

Rev. 0 | Page 21 of 97

Timing

Figure 4 shows the isoSPI timing diagram for a read command

to daisy-chained ADBMS devices. The bottom device and the

corresponding Port A is configured as an SPI port (CSB, SCK,

SDI, and SDO). The isoSPI signals of three stacked devices are

shown labeled with the port (Port A or Port B) and the device

number. Note that ISO B1 and ISO A2 are the same signal but

are shown on each end of the transmission cable that connects

Device 1 and Device 2. Similarly, ISO B2 and ISO A3 are the

same signal, but with the cable delay shown between Device 2

and Device 3.

Bit WN to Bit W0 refer to the 16-bit command code and the 16-

bit PEC of a read command. At the end of Bit W0, the three

devices decode the read command and begin shifting out valid

data on the next rising edge of clock SCK. Bit XN to Bit X0 refer

to the data shifted out by Device 1. Bit YN to Bit Y0 refer to the

data shifted out by Device 2, and Bit ZN to Bit Z0 refer to the

data shifted out by Device 3. All data is readback from the SDO

port on Device 1 in a daisy-chained fashion.

SPI and isoSPI Interface Topologies

Figure 19 to Figure 22 give an overview of all possible SPI and

isoSPI interface configurations using ADBMS2950B and

optionally the cell monitor ADBMS6830B. The ADBMS2950B

is not supporting the low-power cell monitoring (LPCM)

feature of the ADBMS6830B devices. Systems requiring these

features must implement either a dedicated daisy-chain with

ADBMS6830B devices only, or the mixed daisy-chain according

to Figure 22, which allows LPCM operation through the lower

ADBMS6822 channel, indicated by the INTR line and the

LPCM/normal operation (norm. op) label on the related isoSPI

link.

Figure 19. Single Device Digital Isolated 4-wire SPI Interface Configuration

Figure 20. Digital Isolated 4-wire SPI with Non-Reversible Mixed Device isoSPI Daisy-Chain Interface Configuration

Figure 21. Non-Reversible Mixed Device isoSPI Daisy-Chain Interface Configuration

Figure 22. Reversible Mixed Device isoSPI Daisy-Chain Interface Configuration with LPCM Support

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