SI8900-1 Datasheet, PDF (17/30 Pages) Silicon Laboratories – ISOLATED MONITORING ADC

Si8900/1/2
Master to Slave
Slave to Master
D7 D6 D5 D4 D3 D2 D1 D0
11
‐
D7 D6 D5 D4 D3 D2 D1 D0
11
‐
CNFG_0 Write
Command Byte
A) Si8902 CNFG_0 Command Byte
CNFG_0 Write
Command Byte
8µS
Delay _{D7 D6 D5 D4 D3 D2 D1 D0}
11
‐
10
0
0
D7 D6 D5 D4 D3 D2 D1 D0
11
‐
Si8902 CNFG_0 Read Byte
D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0
ADC Data
B) Si8902 ADC Demand Mode Read
CNFG_0 Write
Command Byte
8µS
Delay _D7
11
D0 D7
‐
10
D0 D7
0
D0 D7
D0 D7
D0
0 10
0
0
Si8902 CNFG_0
Read Byte
Periodic ADC Data
C) Si8902 ADC Burst Mode Read
Figure 14. Si8902 ADC Read Operation
4.4. Master Controller Firmware
The user's master controller must include firmware to manage the Si890x Demand and Burst operating modes and
serial port control. In some cases, the master controller may also require a firmware moving average function to
reduce noise. For more information on master controller firmware, see AN638, available for download at
www.silabs.com/isolation.
Rev. 1.0
17