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5616
56162-FUNCTION, 4-DIGIT LCD AUTOMOTIVE CLOCK
2-FUNCTION, 4-DIGIT
LCD AUTOMOTIVE CLOCK—PROGRAMMABLE
The SCL5616HW is a 2-function digital automotive clock circuit.
CTb2
COLON
U Yg3
Df3
Lad3
O Nb3
Rg4
Of4
Pa4
ES2
D CSELECT
GROUND
2040 x 3040 µm
0.080 x 0.120 in
c1
e2
d2
c2
e3
c3
e4
d4
c4
b4
S1
DATA
TINUEERENDwg. No. PC-001
N FABSOLUTE MAXIMUM RATINGS
O ESupply Current, IDD .......................... 2.0 mA
RInput Voltage Range, VIN
C(except VPP) ...................... -0.3 V to VDD
S R(Programming
IPower Voltage, VPP) .................. 18.5 V
OInput Current (except VPP), IIN ......... ±10 mA
D FPower Dissipation, PD ................... 300 mW
Fabricated on a single monolithic chip using silicon-gate CMOS PROM
technology, it offers low cost, low power, and high reliability. It also
includes digital frequency correction, stored in the internal nonvolatile
memory, for easy adjustment of the oscillator nominal frequency.
The SCL5616HW is supplied in wafer form and is rated for
continuous operation over the automotive temperature range of
-40°C to +85°C.
FEATURES
s Digital Tuning of Crystal Frequency
s PROM for Storing Frequency Correction Information
s 12 or 24 Hour Timekeeping Option
s Flashing Colon
s Two Switches Control All Setting Functions
s High Noise Immunity
s Internal Power-Up Reset Circuitry
s Internal Voltage Regulation
Operating Temperature Range,
TA .................................. -40°C to +85°C
Storage Temperature Range,
TS ................................ -65°C to +150°C
Caution: These CMOS devices have static pro-
tection, but are susceptible to damage if exposed
to extremely high static electrical charges.
Always order by complete part number: SCL5616HW .

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5616
2-FUNCTION, 4-DIGIT LCD AUTOMOTIVE CLOCK
+12 V
TYPICAL APPLICATION
6.8 k
4.194304 MHz
CL = 15 pF, RS = 50
+
47 µF
1 M
MINUTES
HOURS
IGNITION VDD
BACKPLANE
S2
S1
GROUNDS
SEGMENTS
AM
PM
Dwg. EC-001
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1990, 1995, Allegro MicroSystems, Inc.

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5616
2-FUNCTION, 4-DIGIT LCD AUTOMOTIVE CLOCK
ELECTRICAL CHARACTERISTICS
(unless otherwise noted).
at
TA
=
-40°C
to
+85°C,
in
Typical
Application
Characteristic
Operating Voltage Range
Zener Voltage
Segment Output Current
Backplane Output Current
LCD Drive Signal
Input Current
Oscillator Frequency
Oscillator Starting Time
Oscillator Stability
Backplane Frequency
Switch Debounce Time
Osc. Feedback Resistance
Osc. Input Capacitance
Osc. Output Capacitance
Supply Current
Symbol
VDD
VDD
IOUT
IOUT
VDISP
IIN
fOSC
tOSC
fOSC
fBP
tDB
ROSC
COSCI
COSCO
IDD
Test Conditions
TA = +25°C
IDD = 1.0 mA
VDD = 5.0 V, VOUT = 4.8 V
VDD = 5.0 V, VOUT = 0.2 V
VDD = 5.0 V, VOUT = 4.8 V
VDD = 5.0 V, VOUT = 0.2 V
VDD 5.0 V
S1, S2, DATA, or SELECT
VDD = Zener voltage
VDD = ±100 mV
VDD = 5.0 V
NOTE: Negative current is defined as coming out of (sourcing) the specified device terminal.
Min.
4.5
5.5
-20
120
-80
240
4.0
-55
0
Limits
Typ.
Max.
——
— 6.8
——
——
——
——
——
— -700
4.194 304 —
— 200
±1.0
64 —
— 62.5
16 —
15 —
30 —
— 1.0
Units
V
V
µA
µA
µA
µA
V
µA
MHz
ms
ppM
Hz
ms
M
pF
pF
mA
DISPLAY FORMAT
AM
a1
b1
g1
PM e1
c1
d1
a2 a3
f2
g2
e2
b2 f3
COLON
c2 e3
b3
g3
c3
d2 d3
a4
f4
g4
b4
e4 c4
d4
Dwg. No. OC-001

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5616
2-FUNCTION, 4-DIGIT LCD AUTOMOTIVE CLOCK
FUNCTIONAL DESCRIPTION
DATA Logic Levels are VDD and Ground
Power-Up Reset. When power up occurs, the hours and minutes
counters are reset, and the clock starts running:
Operation
12-Hour mode and counting starts from 1:00 AM
Programming Modes. Data is loaded by pulling DATA low (1 µs pulse
duration) n times to set the desired bits for frequency correction into
the data input register. This information is latched in the RAM, thus
allowing the testing of the oscillator frequency adjustment without
storing the selected pattern in the PROM cells. The data latched in the
RAM is stored in the PROM cells when DATA is held low for a mini-
mum of 10 ms.
The data stored in the data input register is cleared on any SELECT
transition (low to high or high to low). It is also cleared when the
program power voltage (VPP) is reduced from 18 V to VDD. Clearing the
data input register does not affect the data latched in the RAM.
Program
VPP
DATA
VD
18 V
18 V
VDD
Pulse
Ground
VDD
SELECT
VS
Ground
VDD
Ground
Operation
DATA load for frequency correction
DATA store
Verify stored data
FREQUENCY CORRECTION
FREQUENCY CORRECTION
VPP
VD
VS
tPHDL
123
tDLH
tSVDL
tDHL
twD
tDHPL
tPLSX
VERIFY CYCLE (VPP = VDD )
VS
tSLDV
SEGMENT OUTPUTS
tSHDX
Dwg. No. WC-001-1
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000

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5616
2-FUNCTION, 4-DIGIT LCD AUTOMOTIVE CLOCK
Frequency Correction. The on-chip oscillator circuit increases the
crystal frequency approximately 40 ppm. This ensures that the typical
crystal will operate within the tuning range. With VS at ground, data
pulses are then used to trim the internal clock frequency by 2 to 254
ppm to the required value. The quantity of data pulses needed (1 to
127) is
n = fBP - 64
128 x 10-6
where fBP is the measured frequency at BACKPLANE. Prior to trim-
ming, it must be between 64.000 128 Hz and 64.016 256 Hz.
Operating Modes. The operating modes of the clock are controlled
by the voltages applied to VPP, SELECT, IGNITION, and switches S1
and S2.
Program
VPP
VDD
VDD
18 V
SELECT
VS
S1
VDD
VDD
Ground
Open
Ground
Open
S2 IGNITION
Open
Ground
Open
X
12 V
X
X = Irrelevant, ground or 12 V
Mode
Clock running
Diagnostic
Programming
Clock Running Mode. During the clock running mode, setting
functions are achieved by either momentary or continuous operation
of switches S1 and S2, which are enabled by IGNITION. Hours or
minutes are incremented on S1 or S2 (respectively) depression and
continue at a 1 Hz rate while the switch is depressed.
S1 S2 IGNITION Operation
Open Open
XX
Ground Open
Open Ground
Ground Ground
X
Ground
12 V
12 V
12 V
Clock running
Setting disabled
Set hours
Set Minutes
Change counting sequence (12 to 24 hour
or 24 to 12 hour)
X = Irrelevant, ground or 12 V for IGNITION, ground or open for S1 and S2
Diagnostic Mode. To enter the diagnostic mode, S1 and S2 are oper-
ated with IGNITION connected to 12 V. All segments are displayed for
as long as S1 and S2 are depressed. On opening S1 and S2, the clock
will leave the diagnostic mode and go through a power-up sequence.
In the SCL5616HW, the counting sequence will change (from 12 hour
to 24 hour or from 24 hour to 12 hour). To inhibit the power-up reset,
hold the DATA input low (ground). The counting mode will change
without resetting the hours or minutes counters.