ES51999
4 3/4 and 5 3/4 A/D AUTO
The measurement of true RMS using ES636
If ES636 is used for true RMS measurement, the suggested application circuit is shown
in Figure 4.2. When ES636 is used for true RMS, ADO and ADI pin short together,
TEST5 pin keeps floating, and ACVL pin connects to SGND. And the OVSG pin short
to AGND through a switch.
Connect Pin 2 to –Vs for normal operation,
OVSG
or connect it to +Vs for sleep mode
ACV
100
1K
OR1
VR5
VR4
VR3
VR2
+Vs
-Vs
10K
101K
1.11M
Cav
14
13
1
2
3
4
5
6
7
+Vs
ACVL
ACVH
200
-Vs
12
11
10
+Vs
ADI
ADO
150
470K
9
8
500K
-Vs
Figure 4.2 AC-to-DC circuit using ES636
(5) Diode Measurement
Diode measurement mode shares the same configuration with 4.4000V
voltage mode. The range select bits Q0, Q1 and Q2 are not active in this
mode.
(6) Current measurement
Current measurement has three mode. The following table summarizes the full scale
range of each mode.
Mode
Range Selection
IVSL/IVSH
IVSL/IVSH
IVSH
Full scale
uA
440.00uA/4400.0uA
44.000mA/440.00mA
44.000A
mA
10A
*Operation Mode is based on application circuit .
*Range selection : IVSL ( Q0,Q1,Q2 ) = ( 0,0,0 )
IVSH ( Q0,Q1,Q2 ) = ( 0,0,1 )
13
07/07/06
CYRUSTEK [ Cyrustek corporation ]
