ISL78610 Datasheet, PDF (58/98 Pages) Intersil Corporation – Multi-Cell Li-Ion Battery Manager

ISL78610
Daisy Chain Addressing
When used in a daisy chain system each individual device
dynamically assigns itself a unique address (see “Identify
Command” on page 49). In addition, all daisy chain devices
respond to a common address allowing them to be controlled
simultaneously (e.g., when using the Scan Voltages and Balance
Enable commands). See “Communication Timing” on page 60.
The state of the COMMS SELECT 1, COMMS SELECT 2, COMMS
RATE 0, and COMMS RATE 1 pins can be checked by reading the
CSEL[2:1] and CRAT[1:0] bits in the Comms Setup register, (see
Table 26). The SIZE[3:0] bits show the number of devices in the
daisy chain and the ADDR[3:0] bits indicate the location of a
device within the daisy chain.
Examples of the various read and write command structures for
daisy chain installations are shown in Figures 69C to 69G. The
MSB is transmitted first and the LSB is transmitted last.
TABLE 26. COMMS SETUP REGISTER (ADDRESS 6’h18)
11
10
9
8
7
6
5
4
3
2
1
0
CRAT1
CRAT0
CSEL2
CSEL1
SIZE3 SIZE2 SIZE1 SIZE0 ADDR3 ADDR2 ADDR1 ADDR0
These bits show the status These bits show the status These bits show the daisy chain stack size These bits show this devices position within
of the COMMS RATE 1 and of the COMMS SEL 2 and (i.e., the total number of stacked devices)
the daisy chain stack
COMMS RATE 0 pins
COMMS SEL 1 pins
CS
30µs max
SCLK
30µs max
30µs max
30µs max
DOUT
TRI-STATE
COMMAND
DIN
0001 1010
1001 0100
1100 0000
1100 0000
R
DEVICE _/W PAGE
DATA
DATA TO WRITE
CRC
ADDR
ADDR
ADDRESS
FIGURE 68. SPI HALF DUPLEX (DAISY CHAIN) WRITE REGISTER COMMAND EXAMPLE: WRITE DEVICE 1, DEVICE SETUP REGISTER
DEVICE
ADDRESS
(23, 20)
PAGE
(18, 16)
DATA
ADDRESS
(15, 10)
ZERO
(9, 4)
CRC
(3, 0)
111100110010100000001110
MSB
BYTE 2
BYTE 1
BYTE 0
LSB
FIGURE 69A. DEVICE LEVEL COMMAND: SLEEP
DEVICE
ADDRESS
(23, 20)
PAGE
(18, 16)
DATA
ADDRESS
(15, 10)
ZERO
(9, 4)
CRC
(3, 0)
111100110011110000000111
MSB
BYTE 2
BYTE 1
BYTE 0
LSB
FIGURE 69B. DEVICE LEVEL COMMAND: WAKE-UP
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FN8830.1
June 16, 2016