34 ×128像素矩阵驱动器 34 x 128 pixel matrix driver
Overview
The PCF8531 is a low-power CMOS LCD row and column driver, designed to drive dot matrix graphic displays at multiplex rates of 1:17, 1:26, and 1:34. Furthermore, it can drive up to 128 icons. All necessary functions for the display are provided in a single chip, including on-chip generation of VLCD and the LCD bias voltages, resulting in a minimum of external components and low power consumption. The PCF8531 is compatible with most microcontrollers and communicates via a two-line bidirectional I²C-bus. All inputs are CMOS compatible.
**Remark:**The icon mode is used to reduce current consumption. When only icons are displayed, a much lower operating voltage VLCD can be used and the switching frequency of the LCD outputs is reduced. In most applications it is possible to use VDD as VLCD.
MoreLess
## Features
* Single-chip LCD controller and driver
* 34 row and 128 column outputs
* Display data RAM 34 × 128 bits
* 128 icons last row is used for icons
* Fast-mode I²C-bus interface 400 kbit/s
* Software selectable multiplex rates: 1:17, 1:26, and 1:34
* Icon mode with multiplex rate 1:2:
* Featuring reduced current consumption while displaying icons only
* On-chip:
* Generation of VLCD external supply also possible
* Selectable linear temperature compensation
* Oscillator requires no external components external clock also possible
* Generation of intermediate LCD bias voltages
* Power-On Reset POR
* No external components required
* Software selectable bias configuration
* Logic supply voltage range VDD1 to VSS1: 1.8 V to 5.5 V
* Supply voltage range for on-chip voltage generator VDD2 and VDD3 to VSS1 and VSS2: 2.5 V to 4.5 V
* Display supply voltage range VLCD to VSS:
* Normal mode: 4 V to 9 V
* Icon mode: 3 V to 9 V
* Low-power consumption, suitable for battery operated systems
* CMOS compatible inputs
* Manufactured in silicon gate CMOS process
## Target Applications
* Telecommunication systems
* Automotive information systems
* Point-of-sale terminals
* Instrumentation
## Features