SI8900-1 SILABS [Silicon Laboratories], SI8900-1 Datasheet - Page 22
![no-image](/images/no-image-200.jpg)
SI8900-1
Manufacturer Part Number
SI8900-1
Description
ISOLATED MONITORING ADC
Manufacturer
SILABS [Silicon Laboratories]
Datasheet
1.SI8900-1.pdf
(30 pages)
- Current page: 22 of 30
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Si8900/1/2
6.3. Application Example
Figure 17 shows the Si8900 operating as a single-phase ac line voltage and current monitor. The VDDA dc bias
circuit uses a low-cost 3.3 V linear regulator referenced to the neutral (white wire). The ac current is measured on
ADC input AIN0. The ac line voltage is scaled by resistors R17 and R18 and level-shifted by the 1.5 V VREF. AC
line current is measured using differential amplifier U1 connected across shunt resistor R1. Data is transferred to
the external controller or processor via the isolated UART.
22
Single‐Phase
AC Line
R17
C1
R1
R18
R2
R7
R5
1.5 V
R12
R13
R8
D1
C4
R9
Figure 17. AC Line Monitor Application Example
R3
Dual OpAmp
Low Cost
3.3 V
R4
LDO
U2
U1
R10
1.5 V
C5
R14
R6
R11
R15
1.5 V
C3
C2
Rev. 1.0
AIN0
VDDA
GNDA
AIN1
Si8900
GNDB
VDDB
R
T
X
X
Master Controller
Output Side
Bias Supply
External
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