PCF8531 Datasheet, PDF (1/44 Pages) NXP Semiconductors – 34 x 128 pixel matrix driver

PCF8531
34 x 128 pixel matrix driver
Rev. 04 — 13 June 2008
Product data sheet
1. General description
The PCF8531 is a low-power CMOS LCD row/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 V_LCD 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 bus (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 (V_LCD) can be used and the switching
frequency of the LCD outputs is reduced. In most applications it is possible to use V_DD as
V_LCD.
2. Features
I Single-chip LCD controller/driver
I 34 row and 128 column outputs
I Display data RAM 34 × 128 bits
I 128 icons (last row is used for icons)
I Fast-mode I²C-bus interface (400 kbit/s)
I Software selectable multiplex rates: 1:17, 1:26 and 1:34
I Icon mode with multiplex rate 1:2:
N Featuring reduced current consumption while displaying icons only
I On-chip:
N Generation of V_LCD (external supply also possible)
N Selectable linear temperature compensation
N Oscillator requires no external components (external clock also possible)
N Generation of intermediate LCD bias voltages
N Power-on reset
I No external components required
I Software selectable bias configuration
I Logic supply voltage range V_DD1 to V_SS1: 1.8 V to 5.5 V
I Supply voltage range for on-chip voltage generator V_DD2 and V_DD3 to V_SS1 and V_SS2:
2.5 V to 4.5 V
I Display supply voltage range V_LCD to V_SS:
N Normal mode: 4 V to 9 V
N Icon mode: 3 V to 9 V
I Low-power consumption, suitable for battery operated systems