PCF8579T NXP Semiconductors, PCF8579T Datasheet - Page 7

• Manufacturer Part Number: PCF8579T
• Manufacturer: NXP Semiconductors

Specifications of PCF8579T

• Operating Supply Voltage (typ): 3.3/5V
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Operating Temperature Classification: Industrial
• Package Type: VSO
• Pin Count: 56
• Mounting: Surface Mount
• Power Dissipation: 400mW
• Operating Supply Voltage (min): 2.5V
• Operating Supply Voltage (max): 6V
• Lead Free Status / Rohs Status: Not Compliant

NXP Semiconductors
8. Functional description
PCF8579_5
Product data sheet
7.2 Pin description
8.1 Power-on reset
Table 3.
[1]
[2]
The PCF8579 column driver is designed for use with the PCF8578. Together they form a
general purpose LCD dot matrix chip set.
Typically up to 16 PCF8579s may be used with one PCF8578 (examples of cascading the
devices see
PCF8579s is identified by a unique 4-bit hardware subaddress, set by pins A0 to A3.
The PCF8578 can operate with up to 32 PCF8579s when using two I
addresses. The two slave addresses are set by the logic level on input SA0.
At power-on the PCF8579 resets to a defined starting condition as follows:
Symbol
SDA
SCL
SYNC
CLK
V
TEST
SA0
A3 to A0
V
n.c.
V
V
C39 to C0
1. Display blank (in conjunction with PCF8578)
2. 1:32 multiplex rate
3. Start bank 0 selected
4. Data pointer is set to X, Y address 0, 0
5. Character mode
6. Subaddress counter is set to 0
7. I
SS
DD
3
LCD
, V
[2]
The TEST pin must be connected to V
Do not connect, these pins are reserved.
2
4
[1]
C-bus interface is initialized
Pin description
Table
16,
Pin
VSO56
1
2
3
4
5
6
7
8 to 11
12
13
14, 15
16
17 to 56
Figure
Rev. 05 — 11 May 2009
21,
Figure
SS
LCD column driver for dot matrix graphic displays
LQFP64,
TQFP64
7
8
9
10
11
12
13
14, 16 to 18
20
15, 19, 21, 25
to 29, 34
22, 23
24
30 to 33, 35
to 64, 1 to 6
.
22,
Figure 23
Description
I
I
cascade synchronization output
external clock input/output
ground
test pin
I
I
supply voltage
not connected
LCD bias voltage inputs
LCD supply voltage
LCD column driver outputs
2
2
2
2
C-bus serial data input/output
C-bus serial clock input
C-bus slave address input (bit 0)
C-bus subaddress inputs
and
Figure
24). Each of the
2
C-bus slave
PCF8579
© NXP B.V. 2009. All rights reserved.
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