ISL78610 Datasheet, PDF (61/98 Pages) Intersil Corporation – Multi-Cell Li-Ion Battery Manager

ISL78610
Measurement Timing Diagrams
All measurement timing is derived from the ISL78610’s internal
oscillators. Figures given in the following as typical are those
obtained with the oscillators operating at their nominal
frequencies and with any synchronization timing also at nominal
value. Maximum figures are those obtained with the oscillators
operating at their minimum frequencies and with the maximum
time for any synchronization timing.
Measurement timing begins with a Start Scan signal. This signal
is generated internally by the ISL78610 at the last clock falling
edge of the Scan or Measure command. (This is the last falling
edge of the SPI clock in the case of a stand-alone or master
device, or the last falling edge of the daisy chain clock, in the
case of a daisy chain device.) Daisy chain middle or top devices
impose additional synchronization delays. Communications sent
on the SPI port are passed on to the master device’s daisy chain
port at the end of the first byte of data. Then, for each device,
there is an additional delay of one daisy chain clock cycle.
On receiving the Start Scan signal, the device initializes
measurement circuits and proceeds to perform the requested
measurement(s). Once the measurements are made, some
devices perform additional operations, such as checking for
overvoltage conditions. The measurement command ends when
registers are updated. At this time the registers may be read
using a separate command. A detailed timing breakdown is
provided for each measurement type below.
See Figure 71 for the measurement timing for a Stand-Alone
device. See Figure 72 for the measurement timing for daisy
chain devices.
Tables 30 through 35 give the typical and maximum timing for
the critical elements of measurement process. Each table shows
the timing from the last edge of the Scan command clock.
DIN
SCK
DOUT
SCAN COMMAND
DIN
INTERNAL SCAN
MEASURE
READ REGISTER COMMAND
INTERNAL OPERATION
UPDATE REGISTERS
See Tables 30 through 35
FIGURE 71. SCAN/MEASURE COMMAND TIMING WITH RESPONSE (STAND-ALONE)
SPI SCAN COMMAND
DIN
SCK
INTERNAL
OPERATION (MASTER)
SCAN/MEASURE
UPDATE REGISTERS
See Tables 30 through 35
See Figure 73 on page 62, Table 27 and Table 28 on page 66
UNIT 2
UNIT 6
INTERNAL OPERATION
(DAISY CHAIN UNIT 6)
DAISY CHAIN SCAN COMMAND
4 DAISY CHAIN CLOCKS
SCAN/MEASURE
UPDATE REGISTERS
See Tables 30 through 35
FIGURE 72. MEASUREMENT TIMING (6 DEVICE DAISY CHAIN)
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FN8830.1
June 16, 2016