PCF8537 datasheet(13/82 Pages) NXP

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PCF8537

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Product data sheet

Rev. 1 — 31 May 2012

13 of 82

NXP Semiconductors

PCF8537

Industrial LCD driver for multiplex rates up to 1:8

8.1.12 Command: Frame-frequency

With the Frame-frequency command, the frame frequency and the output clock frequency

can be configured.

[1]

Nominal frame frequency calculated for the default clock frequency of 9600 Hz.

[2]

Duty cycle definition: % HIGH-level time : % LOW-level time.

[3]

Default value.

Table 16.

Frame frequency - frame frequency and output clock frequency command bit

description

Bit

Symbol

Binary value

Description

7 to 5

011

fixed value

4 to 0

F[4:0]

see Table 17

frame frequency values, see Table 17

Table 17.

Frame frequency values

F[4:0]

Nominal frame

frequency ffr (Hz)[1]

Resultant output

clock frequency,

fclk(o) (Hz)

Duty cycle (%)[2]

00000

2880

20 : 80

00001

3360

7 : 93

00010

3840

47 : 53

00011

4368

40 : 60

00100

100

4800

33 : 67

00101

109

5232

27 : 73

00110

120

5760

20 : 80

00111

129.7

6226

13 : 87

01000

141.2

6778

5 : 95

01001

150

7200

50 : 50

01010

160

7680

47 : 53

01011

171.4

8227

43 : 57

01100

177.8

8534

41 : 59

01101

192

9216

36 : 64

01110[3]

200

9600

33 : 67

01111

208.7

10018

30 : 70

10000

218.2

10474

27 : 73

10001

228.6

10973

23 : 77

10010

240

11520

20 : 80

10011

252.6

12125

16 : 84

10100, 10101

266.7

12802

10 : 90

10110, 10111

282.4

13555

5 : 95

11000 to 11111

300

14400

50 : 50

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