ISL78610 Datasheet, PDF (67/98 Pages) Intersil Corporation – Multi-Cell Li-Ion Battery Manager

ISL78610
DIN
SCK
DATA READY
SPI
COMMAND
UNIT 2
UNIT n
SPI RESPONSE
NEXT SPI
COMMAND
Minimum Wait time
between commands.
See Table 29
FIGURE 77. MINIMUM WAIT BETWEEN COMMANDS (DAISY CHAIN RESPONSE - TOP DEVICE)
Measurement Timing Tables
SCAN VOLTAGES
The Scan Voltages command initiates a sequence of
measurements starting with a scan of each cell input from
cell 12 to cell 1, followed by a measurement of pack voltage.
Additional measurements are then performed for the internal
temperature and to check the connection integrity test of the VSS
and VBAT inputs. The process completes with the application of
calibration parameters and the loading of registers. Table 30
shows the times after the start of scan that the cell voltage
inputs are sampled. The voltages are held until the ADC
completes its conversion.
TABLE 30. SCAN VOLTAGES FUNCTION TIMING - DAISY CHAIN MASTER
OR STAND-ALONE DEVICE
EVENT
TYP (µs) MAX (µs)
Sample Cell 12
17
19
Sample Cell 11
38
42
Sample Cell 10
59
65
Sample Cell 9
81
89
Sample Cell 8
102
112
Sample Cell 7
123
135
Sample Cell 6
144
159
Sample Cell 5
166
182
Sample Cell 4
187
206
Sample Cell 3
208
229
Sample Cell 2
229
252
Sample Cell 1
251
276
Complete Cell Voltage Capture (ADC
complete).
Sample VBAT
304
334
Complete VBAT Voltage Capture
318
349
Measure Internal Temperature
423
465
Complete VSS Test
550
605
Complete VBAT Test
726
799
Load Registers
766
842
SCAN TEMPERATURES
The Scan Temperatures command turns on the TEMPREG output
and, after a 2.5ms settling interval, samples the ExT1 to ExT4
inputs. TEMPREG turns off on completion of the ExT4
measurement. The Reference voltage, IC Temperature and
Multiplexer loopback function are also measured. The sequence
is completed with respective registers being loaded.
TABLE 31. SCAN TEMPERATURES FUNCTION TIMING – DAISY CHAIN
MASTER OR STAND-ALONE DEVICE
ELAPSED TIME (µs)
EVENT
TYP
MAX
Turn on TEMPREG
2
2
Sample ExT1
2518
2770
~
Sample ExT4
2564
2820
Sample refeRence
2584
2842
Measure Internal Temperature
2689
2958
Load Registers
2689
2958
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FN8830.1
June 16, 2016