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PDF AS8218 Data sheet ( Hoja de datos )
| Número de pieza | AS8218 | |
| Descripción | Highly Integrated Single Phase 2 Current Energy Metering Integrated Circuits | |
| Fabricantes | austriamicrosystems AG | |
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www.DataSheet4U.com
AS8218 / AS8228
Highly Integrated Single Phase 2-Current Energy
Metering Integrated Circuits with Microcontroller, RTC,
Programmable Multi-Purpose I/Os and LCD Driver
DATA SHEET
1. Key Features
- Precision single-phase, one or two current input
energy measurement front-end including Sigma-
Delta modulators for A/D-conversion and digital
signal processor (DSP).
- Low current consumption of 5mA, depending on
MCU activity.
- Digital phase correction and selectable gain on
both current channels for use with two current
transformers (CT) or one CT and one shunt.
- Power-supply monitor (PSM) for power-on reset
and reset when the supply voltage falls below a
defined threshold.
- Customer programmable 8-bit 8051 compatible
microcontroller (MCU).
- Programmable MCU clock with optional low
power operating conditions.
- 2 x Universal Asynchronous Receiver /
Transmitters (UART) for external
communications such as programme download
and debugging.
- Programmable watchdog timer (WDT) and
external system reset pin.
- Real-time clock/calendar (RTC) with on-chip
digital calibration and separate battery supply
pin.
- On-chip voltage reference (VREF) with small
temperature coefficient.
- Low power 3.0 – 4.0MHz crystal oscillator.
- SPI compatible interface for external EEPROM
memory.
- Standard on-chip LCD driver (LCDD) interface.
- Programmable multi-purpose I/Os (MPIO) with
selectable data direction, pull-up or pull-down
resistors and drive strength.
- Mains current lead/lag status indication for
reactive energy measurement.
- Low power battery operating mode for meter
reading when Mains voltage is not present.
- The AS8218 and AS8228 ICs offer the following
options:
AS8218: 20 x 4 segment LCDD
9 x multi-purpose I/O (MPIO)
AS8228: 24 x 4 segment LCDD
12 x multi-purpose I/O (MPIO)
2. General Description
The AS8218 / AS8228 are highly integrated CMOS
single-phase energy metering devices for fully
electronic LCD meter systems. The AS8218 /
AS8228 have been designed to ensure the meters
full compliance with the international Standards
IEC62052 and ANSI.
The AS8218 / AS8228 ICs include all the functions
required for conventional 1 current or 2-current
anti-tamper meters. The functions include precision
energy measurement, an 8-bit microcontroller unit
(MCU), an on-chip Liquid Crystal Display driver
(LCDD), programmable multi-purpose
Inputs/Outputs (MPIO), a real time clock/calendar
(RTC) for complex tariff functions such as time-of-
use or maximum demand billing and a Serial
Peripheral Interface (SPI) for reading data from and
writing data to an external non-volatile memory
(EEPROM).
The AS8218 / AS8228 ICs have a dedicated energy
measurement front-end, which includes an analog
front-end and programmable Digital Signal
Processor (DSP) from which active energy, mains
voltage and mains current are provided. Reactive
and apparent energy can also be calculated.
The on-chip 8-bit 8051 compatible microcontroller
is freely programmable and provides user access to
the various functional blocks. The dedicated
Universal Asynchronous Receiver / Transmitter
(UART1) in the System Control block provides
access to various system functions and blocks. A
second UART (UART2) is also provided, which may
for example be used for debugging. The on-chip
memory includes 24kByte program memory and
1kByte data memory. The meter system designer
can select the size of the external EEPROM
memory from 1kByte to 32kByte (in binary steps).
Revision 3.0, 31-May-06
Page 1 of 123
1 page  
Data Sheet AS8218 / AS8228
www.DataSheet4U.com
Pin No.
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
Pin Name
AS8218
IO1
IO2
IO3
VDDD
VSSD
IO4
IO5
IO6
IO7
IO8
SI
VSSD
VDDD
S_N
SO
SC
n.c.
n.c.
n.c.
TXD
RXD
VDD_BAT
XIN
Pin Name
AS8228
IO1
IO2
IO3
VDDD
VSSD
IO4
IO5
IO6
IO7
IO8
SI
VSSD
VDDD
S_N
SO
SC
IO9
IO10
IO11
TXD
RXD
VDD_BAT
XIN
Type Description
DIO Programmable multi-purpose input/output, with selectable pull-up or
pull-down resistors and selectable drive strength.
DIO Programmable multi-purpose input/output, with selectable pull-up or
pull-down resistors and selectable drive strength.
DIO Programmable multi-purpose input/output, with selectable pull-up or
pull-down resistors and selectable drive strength.
S Positive digital supply. VDDD provides the positive supply voltage to the
digital circuitry and is internally connected to pin 22. The required supply
voltage is 3.3V ±10%.
S Negative digital supply. VSSD is the ground reference for the digital
circuitry.
DIO Programmable multi-purpose input/output, with selectable pull-up or
pull-down resistors and selectable drive strength.
DIO Programmable multi-purpose input/output, with selectable pull-up or
pull-down resistors and selectable drive strength.
DIO Programmable multi-purpose input/output, with selectable pull-up or
pull-down resistors and selectable drive strength.
DIO Programmable multi-purpose input/output, with selectable pull-up or
pull-down resistors and selectable drive strength.
DIO Programmable multi-purpose input/output, with selectable pull-up or
pull-down resistors and selectable drive strength.
DIPD Serial peripheral interface (SPI) for external EEPROM: Serial data input.
SI is a digital input with an on-chip pull-down resistor.
S Negative digital supply. VSSD is the ground reference for the digital
circuitry.
S Positive digital supply. VDDD provides the positive supply voltage to the
digital circuitry and is internally connected to pin 13. The required supply
voltage is 3.3V ±10%.
DO Serial peripheral interface (SPI) for external EEPROM: Chip select
(active low).
DO Serial peripheral interface (SPI) for external EEPROM: Serial data
output
DO Serial peripheral interface (SPI) for external EEPROM: Serial clock
DIO Programmable multi-purpose input/output, with selectable pull-up or
pull-down resistors and selectable drive strength.
DIO Programmable multi-purpose input/output, with selectable pull-up or
pull-down resistors and selectable drive strength.
DIO Programmable multi-purpose input/output, with selectable pull-up or
pull-down resistors and selectable drive strength.
DO Universal Asynchronous Receiver/Transmitter (UART1) serial transmit
data output.
DIPU Universal Asynchronous Receiver/Transmitter (UART1) serial receive
data input. RXD is a digital input with an on-chip pull-up resistor.
S Battery backup supply voltage input for the system timing and real time
clock (RTC).
AI A 3.0 to 4.0MHz crystal may be connected across XIN and XOUT
without the requirement for external load capacitors. Alternatively, an
external clock signal may be applied to XIN.
Revision 3.0, 31-May-06
Page 5 of 123
5 Page 
Data Sheet AS8218 / AS8228
www.DataSheet4U.com
Parameter
Symbol Min
Typ
Max
Unit Notes
High level output current
IOH
8 mA If ‘8mA’ is selected. Tested at
VDD=3.0V and Vout=VOH
Low level output current IOL -8
mA If ‘8mA’ is selected. Tested at
VDD=3.0V and Vout=VOL
LCDD Outputs
The Liquid Crystal display driver (LCDD) outputs are specified in the LCD Driver section of this data sheet.
6.4 Electrical System Specification
Parameter
Symbol Min Typ Max
Unit Notes
Input Signals
Voltage channel input voltage
Current channel input voltage
(Gain=4)
Current channel input voltage
(Gain=16)
Current channel input voltage
(Gain=20)
|VVP|
|VI1P|, |VI2P|
|VI1P|, |VI2P|
|VI1P|, |VI2P|
100 212
150 212
mVp
mVp
Referenced to VSSA
Referenced to VSSA
38 54 mVp Referenced to VSSA
30 42 mVp Referenced to VSSA
Mains frequency
fmains
45
65 Hz
Dynamic range current
DR(I)
600:1
Dynamic range power
DR(P)
2000:1
Accuracy
0.1 % Reading
Error variation over dyn. range
err(dr)
0.2 % 1)
Error variation over temperature
err(temp)
0.5 % Within operating
temperature range, 1)
Error variation over cos(phi)
err(cosphi)
0.5 % From 1 to 0.5, 1)
Error variation with VDD
err(VDD)
0.2 % 1)
Output pulse jitter
J
0.1 % 2)
Mains voltage
Measured current
Vmains
Imax
264 V(rms) 240V + 10%, 3)
120 A(rms) 3)
Measurement bandwidth
BW
1.75
kHz
Notes:
1) Errors determined during energy measurement using a demoboard and a reference meter with high
accuracy (0.05%), which calculates the actual error.
2) Difference between largest and smallest error of 20 successive error samples; maximum meter constant:
1,600i/kWh; reference meter: 10,000 x DUT-meter-constant; measured at 5% Ib, Ib and Imax.
3) What is used for system considerations/calculations.
Revision 3.0, 31-May-06
Page 11 of 123
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AS8218.PDF ] | |
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