Data Sheet AS8218 / AS8228
Pin No.
10
11
12
13
Pin Name
AS8218
IO1
IO2
IO3
VDDD
Pin Name
AS8228
IO1
IO2
IO3
VDDD
Type Description
DIO
DIO
DIO
S
Programmable multi-purpose input/output, with selectable pull-up or
pull-down resistors and selectable drive strength.
Programmable multi-purpose input/output, with selectable pull-up or
pull-down resistors and selectable drive strength.
Programmable multi-purpose input/output, with selectable pull-up or
pull-down resistors and selectable drive strength.
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%.
Negative digital supply. VSSD is the ground reference for the digital
circuitry.
Programmable multi-purpose input/output, with selectable pull-up or
pull-down resistors and selectable drive strength.
Programmable multi-purpose input/output, with selectable pull-up or
pull-down resistors and selectable drive strength.
Programmable multi-purpose input/output, with selectable pull-up or
pull-down resistors and selectable drive strength.
Programmable multi-purpose input/output, with selectable pull-up or
pull-down resistors and selectable drive strength.
Programmable multi-purpose input/output, with selectable pull-up or
pull-down resistors and selectable drive strength.
14
15
16
17
18
19
20
21
22
VSSD
IO4
IO5
IO6
IO7
IO8
SI
VSSD
VDDD
VSSD
IO4
IO5
IO6
IO7
IO8
SI
VSSD
VDDD
S
DIO
DIO
DIO
DIO
DIO
DIPD Serial peripheral interface (SPI) for external EEPROM: Serial data input.
SI is a digital input with an on-chip pull-down resistor.
S
S
Negative digital supply. VSSD is the ground reference for the digital
circuitry.
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%.
Serial peripheral interface (SPI) for external EEPROM: Chip select
(active low).
Serial peripheral interface (SPI) for external EEPROM: Serial data
output
Serial peripheral interface (SPI) for external EEPROM: Serial clock
Programmable multi-purpose input/output, with selectable pull-up or
pull-down resistors and selectable drive strength.
Programmable multi-purpose input/output, with selectable pull-up or
pull-down resistors and selectable drive strength.
Programmable multi-purpose input/output, with selectable pull-up or
pull-down resistors and selectable drive strength.
Universal Asynchronous Receiver/Transmitter (UART1) serial transmit
data output.
23
24
25
26
27
28
29
30
31
32
S_N
SO
SC
n.c.
n.c.
n.c.
TXD
RXD
VDD_BAT
XIN
S_N
SO
SC
IO9
IO10
IO11
TXD
RXD
VDD_BAT
XIN
DO
DO
DO
DIO
DIO
DIO
DO
DIPU Universal Asynchronous Receiver/Transmitter (UART1) serial receive
data input. RXD is a digital input with an on-chip pull-up resistor.
S
AI
Battery backup supply voltage input for the system timing and real time
clock (RTC).
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
AMSCO [ AUSTRIAMICROSYSTEMS AG ]
