Data Sheet AS8218 / AS8228
3. Typical Application Circuit
3.3V
3.3V
+
+
LCD
3.3V
XIN XOUT
32
33
Low
Power
Oscillator
VDDA
7
Low
Power
Divider
13
VDDD
22
LBP0
LBP1
LBP2
LBP3
kWh
Vrms
Irms
37 38 39 40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
9
LSD0
LSD1
LSD2
LSD3
LSD4
LSD5
LSD6
LSD7
LSD8
LSD9
LSD10
LSD11
LSD12
LSD13
LSD14
LSD15
LSD16
LSD17
LSD18
LSD19
LSD20
LSD21
LSD22
LSD23
IO0
IO1
IO2
IO3
IO4
IO5
IO6
IO7
IO8
IO9
IO10
IO11
LED
DIRO
FAULT
VDD_BAT 31
RTC
System Timing & RTC
LOAD
I1P
3
Analog Front End
LCD
Driver
SDM
I1N
I2N
4
6
SDM
I2P
VP
5
1
DSP
MCU
SDM
VN
2
I/Os
Examples
only
10
11
WDT
RES_N
34
Multi-
purpose
I/Os
12
15
16
17
18
19
26
27
28
Push-Button
Reference pulses
for calibration
AS8228 only
System
Control
UART1
23
20
24
25
S_N
SI
SO
SC
SPI
8
VSSA
14
VSSD
21
VSSD
29
TXD
30
RXD
EEPROM
S 1
Q
2
3.3V W 3
VSS
4
8 VCC 3.3V
HOLD 3.3V
7
6 C
5 D
VI
VO
3.3V
+
GND
N
L
Figure 1:
Typical application circuit of the AS8218 / AS8228
Revision 3.0, 31-May-06
AS8228 only
Page 3 of 123
AMSCO [ AUSTRIAMICROSYSTEMS AG ]
