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MC14LC5003 View Datasheet(PDF) - Motorola => Freescale

Part Name
Description
View to exact match
MC14LC5003
Motorola
Motorola => Freescale Motorola
MC14LC5003 Datasheet PDF : 17 Pages
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PIN DESCRIPTIONS
A0, A1,A2 for MC14LC5003/5004
A0/A1,A2 for MC14LC5002
Address Inputs
The address pins must be tied to VDD. This defines the
normal operation mode.
10 M
1M
CAUTION
The configuration A0, A1, A2 = 111 must be used. The config-
uration A0, A1, A2 = 000 is reserved for Motorola’s use only.
All three address pins should never be tied to 0 V simultaneous-
ly.
100 k
10 k
1k
10 k
100 k
1M
OSCILLATOR FREQUENCY
10 M
ENB
Enable Input
If the ENB pin is tied to VDD, the MC14LC5002/5003/5004
will always latch the data after 128 bits have been received.
The latched data is multiplexed and fed to the frontplane driv-
ers for display. If external control of this latching function is
required, then the ENB pin should be held low, followed by
one high pulse on ENB when data display is required. (This
may be useful in a system where MC14LC5002/5003/5004 is
permanently addressed and only the last 128 bits of data sent
are required to be latched for display). The pulse on the ENB
pin must occur while DCLK is high.
DCLK, Din
Data Clock and Data Input
Address input and data input controls. See Data Input Pro-
tocol sections for relevant option.
OSC1, OSC2
Oscillator Pins
To use the on-board oscillator, an external resistor should
be connected between OSC1 and OSC2. Optionally, the
OSC1 pin may be driven by an externally generated clock
signal.
A resistor of 680 kconnected between OSC1 and OSC2
pins gives an oscillator frequency of about 30 kHz, giving ap-
proximately 30 Hz as seen at the LCD driver outputs. A resistor
of 200 kgives about 100 kHz, which results in 100Hz at the
driver outputs. LCD manufacturers recommend an LCD drive
frequency of between 30 Hz and 100 Hz. See Figure 6.
Figure 6. Oscillator Frequency vs. Load Resistance
(Approximate)
FP1-FP32
Frontplane Drivers
Frontplane driver outputs.
BP1-BP4
Backplane Drivers
Backplane driver outputs.
VLCD
LCD Driver Supply
Power supply input for LCD drive outputs. May be used to
supply a temperature-compensated voltage to the LCD drive
section, which can be separate from the logic voltage supply,
VDD.
VDD
Positive Power Supply
This pin supplies power to the main processor interface and
logic portions of the device. The voltage range is 2.7 to 5.5 V
with respect to the VSS pin.
For optimum performance, VDD should be bypassed to
VSS using a low inductance capacitor mounted very closely
to these pins. Lead length on this capacitor should be mini-
mized.
VSS
Ground
Common ground.
MOTOROLA
MC14LC5002 • MC14LC5003 • MC14LC5004
3–11
 

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