PCA8551 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2015. All rights reserved.
Product data sheet Rev. 2 — 24 March 2015 6 of 57
NXP Semiconductors
PCA8551
Automotive 36 × 4 LCD segment driver
7.2 Pin description
[1] Can be configured by command, see Table 6.
[2] A series resistance between V
DD
and the pin must not exceed 1 k to ensure proper functionality, see Section 16.3.
Table 4. Pin description
Input or input/output pins must always be at a defined level (V
SS
or V
DD
) unless otherwise specified.
Pin Symbol Type Description
1 to 5,
18 to 48
SEG0 to SEG35 output LCD segment outputs
6 to 9 COM0 to COM3 output LCD backplane outputs
10 VLCD supply LCD supply voltage
11 VDD supply supply voltage
12 VSS supply ground supply
14 CLK input/output internal oscillator output, external oscillator input
[1]
• must be left open if unused
15 SCL input serial clock input
17 PORE
[2]
input Power-On Reset (POR) enable
• connect to V
DD
for enabling POR
• connect to V
SS
(or leave open) for disabling POR
Pin layout depending on product and bus type
PCA8551ATT
(I
2
C-bus)
PCA8551BTT
(SPI-bus)
13 RST
- input reset input, active LOW
- SDIO input/output serial data input/output
16 SDA - input/output serial data line
-CE
input chip enable input, active LOW
