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PCF8577C Schematic ( PDF Datasheet ) - NXP Semiconductors

Teilenummer PCF8577C
Beschreibung LCD direct/duplex driver
Hersteller NXP Semiconductors
Logo NXP Semiconductors Logo 




Gesamt 30 Seiten
PCF8577C Datasheet, Funktion
PCF8577C
LCD direct/duplex driver with I²C-bus interface
Rev. 5 — 10 October 2014
Product data sheet
1. General description
The PCF8577C is an LCD driver which drives up to 32 segments directly, or 64 segments
in a duplex configuration.
The two-line I2C-bus interface substantially reduces wiring overheads in remote display
applications. I2C-bus traffic is minimized in multiple IC applications by automatic address
incrementing, hardware subaddressing and display memory switching (direct drive
mode).To allow partial VDD shutdown, the ESD protection system of the SCL and SDA
pins does not use a diode connected to VDD.
For a selection of NXP LCD segment drivers, see Table 13 on page 25.
2. Features and benefits
Direct/duplex drive modes with up to 32/64 LCD-segment drive capability per device
Operating supply voltage: 2.5 V to 6 V
Low power consumption
I2C-bus interface
Optimized pinning for single plane wiring
Single-pin built-in oscillator
Auto-incremented loading across device subaddress boundaries
Display memory switching in direct drive mode
May be used as I2C-bus output expander
System expansion up to 256 segments
Power-on reset blanks display
I2C-bus address: 0111 0100.
3. Ordering information
Table 1. Ordering information
Type number
Package
Name
PCF8577CT
VSO40
Description
plastic very small outline package; 40
leads
Version
SOT158-1






PCF8577C Datasheet, Funktion
NXP Semiconductors
PCF8577C
LCD direct/duplex driver with I²C-bus interface
The control register also has two display control bits. These bits are named MODE and
BANK. The MODE bit selects whether the display outputs are configured for direct or
duplex drive displays. The BANK bit allows the user to display BANK A or BANK B.
7.4 Auto-incremented loading
After each segment byte is loaded, the SBV is incremented automatically. Thus
auto-incremented loading occurs if more than one segment byte is received in a data
transfer.
Since the SBV addresses both device and segment registers in all addressed chips,
auto-incremented loading may proceed across device boundaries if the hardware
subaddresses are arranged contiguously.
7.5 Direct drive mode
The PCF8577C is set to the direct drive mode by loading the MODE control bit with
logic 0. In this mode, only four bytes are required to store the data for the 32 segment
drivers. Setting the BANK bit to logic 0 selects even bytes (BANK A), setting the BANK bit
to logic 1 selects odd bytes (BANK B).
In the direct drive mode, the SBV is auto-incremented by two after the loading of each
segment byte register. This means, that auto-incremented loading of BANK A or BANK B
is possible. Either bank may be completely or partially loaded irrespective of which bank is
being displayed. Direct drive output waveforms are shown in Figure 4.
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Von(RMS) = VDD VSS; Voff(RMS) = 0.
Fig 4. Direct drive mode display output waveforms
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7.6 Duplex mode
The PCF8577C is set to the duplex mode by loading the MODE bit with logic 1. In this
mode, a second backplane signal (BP2) is needed and pin A2/BP2 is used for this;
therefore A2 and its equivalent SBV bit V5 are undefined. The SBV auto-increments by
one between loaded bytes.
All of the segment bytes are required to store data for the 32 segment drivers and the
BANK bit is ignored.
PCF8577C
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 5 — 10 October 2014
© NXP Semiconductors N.V. 2014. All rights reserved.
6 of 33

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PCF8577C pdf, datenblatt
NXP Semiconductors
PCF8577C
LCD direct/duplex driver with I²C-bus interface
10. Limiting values
Table 8. Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134).
Symbol Parameter
Conditions
VDD
VLCD
VI
VO
supply voltage
LCD supply voltage
input voltage
output voltage
on each of the pins
S1 to S32 and BP1 and BP2
II
IO
IDD
ISS
IDD(LCD)
Ptot
Po
VESD
input current
output current
supply current
ground supply current
LCD supply current
total power dissipation
output power
electrostatic discharge
voltage
HBM
MM
Ilu
Tstg
Tamb
latch-up current
storage temperature
ambient temperature
operating device
Min
0.5
[1] VDD 8.0
0.5
[1] 0.5
20
25
50
50
50
-
-
[2] -
[3] -
[4] -
[5] 65
40
Max
+8.0
VDD
VDD + 0.5
+8.0
+20
+25
+50
+50
+50
500
100
2 000
200
100
+150
+85
Unit
V
V
V
V
mA
mA
mA
mA
mA
mW
mW
V
V
mA
C
C
[1] Values with respect to VDD.
[2] Pass level; Human Body Model (HBM), according to Ref. 6 “JESD22-A114”.
[3] Pass level; Machine Model (MM), according to Ref. 7 “JESD22-A115”.
[4] Pass level; latch-up testing according to Ref. 8 “JESD78” at maximum ambient temperature (Tamb(max)).
[5] According to the store and transport requirements (see Ref. 12 “UM10569”) the devices have to be stored at a temperature of +8 C to
+45 C and a humidity of 25 % to 75 %.
PCF8577C
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 5 — 10 October 2014
© NXP Semiconductors N.V. 2014. All rights reserved.
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SeitenGesamt 30 Seiten
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