Datasheet

CY8C21634, CY8C21534, CY8C21434
CY8C21334, CY8C21234
Document Number: 38-12025 Rev. AB Page 9 of 53
20-pin Part Pinout
Figure 4. CY8C21334 20-pin PSoC Device
SSOP
V
DD
P0[6], A, I, M
P0[4], A, I, M
P0[2], A, I, M
P0[0], A, I, M
XRES
P1[6], M
P1[4], EXTCLK, M
P1[2], M
P1[0], I2C SDA, M
20
19
18
17
16
15
14
13
12
11
1
2
3
4
5
6
7
8
9
10
A, I, M, P0[7]
A, I, M, P0[5]
A, I, M, P0[3]
A, I, M, P0[1]
M, I2C SCL, P1[7]
M, P1[3]
V
SS
V
SS
M, I2C SDA, P1[5]
M, I2C SCL, P1[1]
Pin Definitions
CY8C21334 20-pin SSOP
Pin No.
Type
Name Description
Digital Analog
1 I/O I, M P0[7] Analog column mux input
2 I/O I, M P0[5] Analog column mux input
3 I/O I, M P0[3] Analog column mux input, integrating input
4 I/O I, M P0[1] Analog column mux input, integrating input
5 Power V
SS
Ground connection
6 I/O M P1[7] I
2
C SCL
7 I/O M P1[5] I
2
C SDA
8 I/O M P1[3]
9 I/O M P1[1] I
2
C SCL, ISSP-SCLK
[10]
10 Power V
SS
Ground connection.
11 I/O M P1[0] I
2
C SDA, ISSP-SDATA
[10]
12 I/O M P1[2]
13 I/O M P1[4] Optional external clock input (EXTCLK)
14 I/O M P1[6]
15 Input XRES Active high external reset with internal pull-down
16 I/O I, M P0[0] Analog column mux input
17 I/O I, M P0[2] Analog column mux input
18 I/O I, M P0[4] Analog column mux input
19 I/O I, M P0[6] Analog column mux input
20 Power V
DD
Supply voltage
LEGEND A = Analog, I = Input, O = Output, and M = Analog Mux Input.
Note
10. These are the ISSP pins, which are not High Z at POR. See the PSoC Technical Reference Manual for details.