CY8C27x43 Final Data Sheet
1. Pin Information
1.1.2
20-Pin Part Pinout
Type
Table 1-2. 20-Pin Part Pinout (SSOP, SOIC)
Pin
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
IO
IO
IO
IO
Power
IO
IO
IO
IO
Input
I
IO
IO
I
IO
IO
IO
IO
Power
Digital
Analog
Pin
Name
P0[7]
P0[5]
P0[3]
P0[1]
SMP
P1[7]
P1[5]
P1[3]
P1[1]
Vss
P1[0]
P1[2]
P1[4]
P1[6]
XRES
P0[0]
P0[2]
P0[4]
P0[6]
Vdd
Description
Analog column mux input.
Analog column mux input and column output.
Analog column mux input and column output.
Analog column mux input.
Switch Mode Pump (SMP) connection to
external components required.
I2C Serial Clock (SCL)
I2C Serial Data (SDA)
Crystal Input (XTALin), I2C Serial Clock (SCL)
Ground connection.
Crystal Output (XTALout), I2C Serial Data
(SDA)
Optional External Clock Input (EXTCLK)
Active high external reset with internal pull
down.
Analog column mux input.
Analog column mux input and column output.
Analog column mux input and column output.
Analog column mux input.
Supply voltage.
CY8C27243 20-Pin PSoC Device
AI, P0[7]
AIO, P0[5]
AIO, P0[3]
AI, P0[1]
SMP
I2C SCL, P1[7]
I2C SDA, P1[5]
P1[3]
I2C SCL, XTALin, P1[1]
Vss
IO
IO
IO
IO
Power
I
IO
IO
I
1
2
3
4
5
6
7
8
9
10
SSOP
SOIC
20
19
18
17
16
15
14
13
12
11
Vdd
P0[6], AI
P0[4], AIO
P0[2], AIO
P0[0], AI
XRES
P1[6]
P1[4], EXTCLK
P1[2]
P1[0], XTALout, I2C SDA
LEGEND
: A = Analog, I = Input, and O = Output.
August 3, 2004
Document No. 38-12012 Rev. *I
9
CYPRESS [ CYPRESS SEMICONDUCTOR ]
