ISL78610 Datasheet, PDF (69/98 Pages) Intersil Corporation – Multi-Cell Li-Ion Battery Manager

ISL78610
In the following tables, internal and daisy clocks are assumed to be
slow by 10% and the SPI clock is assumed to be at the stated speed.
For an example, consider a stack of 6 devices. To get the full scan
time with a daisy clock of 500kHz and SPI clock of 2MHz, it takes
77.6µs from the start of the Scan All command to the start of the
internal scan of the top device (see Table 27), 842µs to complete
an internal scan of all voltages (see Table 30 on page 67),
5.337ms to read all cell voltages from all devices (see Table 38
on page 70) and 18µs delay before issuing another command. In
this case, all cell voltages in the host controller can be updated
every 6.28ms.
4-BYTE RESPONSE
Tables 36 and 37 show the calculated timing for read operations
for 4 byte responses. This is the timing for an ACK or NAK, as well
as Read Register command.
TABLE 36. READ TIMING (MAX): 4-BYTE RESPONSE, DAISY CLOCK = 500kHz, SPI CLOCK = 2MHz
TOP
STACK
DEVICE
COMMAND TIME TO
START OF RESPONSE
(EACH DAISY DEVICE)
(µs)
TIME TO COMPLETE RESPONSE (DAISY CHAIN)
MASTER DEVICE
(µs)
MIDDLE DEVICE
(µs)
TOP DEVICE
(µs)
ALL DEVICES
(µs)
2
80
139
110
250
3
82
142
201
113
455
4
85
144
203
115
666
5
87
146
206
117
880
6
89
148
208
119
1099
7
91
151
210
121
1323
8
93
153
212
124
1550
9
96
155
215
126
1783
10
98
157
217
128
2020
11
100
159
219
130
2261
12
102
162
221
133
2506
13
105
164
223
135
2757
14
107
166
226
137
3011
COMMAND +
RESPONSE ALL
DEVICES
(µs)
410
702
1004
1314
1633
1961
2298
2643
2998
3361
3734
4115
4505
TABLE 37. READ TIMING (MAX): 4-BYTE RESPONSE, DAISY CLOCK = 250kHz, SPI CLOCK = 2MHz
TOP
STACK
DEVICE
COMMAND TIME TO
START OF RESPONSE
(EACH DAISY DEVICE)
(µs)
TIME TO COMPLETE RESPONSE (DAISY CHAIN)
MASTER DEVICE
(µs)
MIDDLE DEVICE
(µs)
TOP DEVICE
(µs)
ALL DEVICES
(µs)
2
156
228
204
432
3
160
233
383
208
824
4
165
237
388
213
1226
5
169
242
392
217
1636
6
173
246
397
221
2055
7
178
251
401
226
2483
8
182
255
406
230
2919
9
187
259
410
235
3365
10
191
264
415
239
3820
11
196
268
419
244
4283
12
200
273
423
248
4755
13
205
277
428
253
5237
14
209
282
432
257
5727
COMMAND +
RESPONSE ALL
DEVICES
(µs)
743
1304
1884
2480
3095
3727
4378
5045
5731
6435
7156
7895
8652
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FN8830.1
June 16, 2016