73S1209F Data Sheet
DS_1209F_004
1 Hardware Description
1.1 Pin Description
Table 1: 73S1209F Pinout Description
Pin (68 QFN)
Pin (44 QFN)
Equivalent
Circuit*
Pin Name
Description
Type
X12IN
X12OUT
ROW (5:0)
0
1
2
3
4
5
COL(4:0)
0
1
2
3
4
USR(8:0)
0
1
2
3
4
5
6
7
8
SCL
10
11
21
22
24
34
37
38
12
13
14
16
19
8
9
I
O
I
MPU clock crystal oscillator input pin. A 1MΩ resistor is
required between pins X12IN and X12OUT.
MPU clock crystal oscillator output pin.
Keypad row input sense.
O
Keypad column output scan pins.
IO
36
35
33
31
30
29
23
20
32
5
24
23
22
21
20
19
14
13
5
O
General-purpose user pins, individually configurable as
inputs or outputs or as external input interrupt ports.
I
2
C (master mode) compatible Clock signal. Note: the
pin is configured as an open drain output. When the
I2C interface is being used, an external pull up resistor
is required. A value of 3K is recommended.
I
2
C (master mode) compatible data I/O. Note: this pin is
bi-directional. When the pin is configured as output, it is
an open drain output. When the I2C interface is being
used, an external pull up resistor is required. A value of
3K is recommended.
Special output drivers, programmable pull-down current
to drive LEDs. May also be used as inputs.
Serial UART Receive data pin.
Serial UART Transmit data pin.
General purpose interrupt input.
Rev. 1.2
SDA
6
6
IO
LED(1:0)
0
1
RXD
TXD
INT3
8
1
3
17
18
51
3
4
11
12
IO
I
O
I
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