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PDF PCF1172CU Data sheet ( Hoja de datos )
| Número de pieza | PCF1172CU | |
| Descripción | 31/2-digit LCD car clock | |
| Fabricantes | NXP Semiconductors | |
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INTEGRATED CIRCUITS
DATA SHEET
PCF1172C
31/2-digit LCD car clock
Product specification
Supersedes data of September 1993
File under Integrated Circuits, IC16
1997 Apr 16
1 page  
Philips Semiconductors
31/2-digit LCD car clock
Product specification
PCF1172C
Time correction ±2 minutes, switch S3
.This switch operates in two ranges:
• Displayed time ≥ 58 minutes 00 seconds
• Displayed time ≤ 1 minute 59 seconds.
When switch S3 is pressed in these ranges, the minutes
and seconds are reset to zero. For displayed
time ≥ 58 minutes 00 seconds, the hour is also
incremented by one.
Single/continuous correction mode, switch S6
For single-set correction mode, S6 is connected to VDD.
Each closure of S1 or S2 advances the counter by one.
For continuous-set correction mode, S6 is connected to
VSS. Momentary closure of S1 or S2 causes single
increments as for single-set correction mode. If S1 or S2 is
kept closed for more than 1s, the counter is automatically
incremented by 1 for each full second that S1 or S2 is kept
closed.
INPUT OPTIONS
In the description below S4 and S6 refer to the external
switches shown in Fig.5 rather than to the corresponding
inputs.
In a real application, these inputs will normally be bonded
to the appropriate level to give the required function mode.
Internal/external regulation, switch S4
For internal regulation, S4 is closed, the internal voltage
regulator is active and the voltage supply for the LCD is
regulated to 5 V. For external regulation, S4 is open and
the circuit has to be supplied with an externally regulated
voltage.
TESTING
In normal operation the test inputs TR (pin 38) and TS
(pin 39) have to be connected to VDD (pin 23). A test
frequency (64 Hz) is available at BP (pin 5). The test mode
is activated by connecting TS to VSS (pin 20). All output
frequencies are then increased by a factor of 65536.
In this mode the maximum input frequency is 100 kHz
(external generator at OSC IN). By connecting TR to VSS
all counters (seconds, minutes and hours) are stopped.
After connecting TR to VDD all counters start from an initial
state.
The switches/inputs described above also operate in the
test mode.
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 134).
SYMBOL
PARAMETER
VDD supply voltage with respect to VSS with internal
regulation disconnected
VI
Tamb
Tstg
all input voltages
operating ambient temperature
storage temperature
CONDITIONS
MIN.
note 1
−
MAX.
8
UNIT
V
VSS − 0.3
−40
−55
VDD + 0.3
+85
+125
V
°C
°C
Note
1. Connecting the supply voltage with reverse polarity, will not harm the circuit, provided the current is limited to 10 mA
by the external resistor.
HANDLING
Inputs and outputs are protected against electrostatic discharges in normal handling. However, to be totally safe, it is
advisable to take handling precautions appropriate to handling MOS devices. Advice can be found in
“Data Handbook IC16, General, Handling MOS Devices”.
1997 Apr 16
5
5 Page 
Philips Semiconductors
31/2-digit LCD car clock
Product specification
PCF1172C
SOLDERING
Introduction
There is no soldering method that is ideal for all IC
packages. Wave soldering is often preferred when
through-hole and surface mounted components are mixed
on one printed-circuit board. However, wave soldering is
not always suitable for surface mounted ICs, or for
printed-circuits with high population densities. In these
situations reflow soldering is often used.
This text gives a very brief insight to a complex technology.
A more in-depth account of soldering ICs can be found in
our “IC Package Databook” (order code 9398 652 90011).
Reflow soldering
Reflow soldering techniques are suitable for all VSO
packages.
Reflow soldering requires solder paste (a suspension of
fine solder particles, flux and binding agent) to be applied
to the printed-circuit board by screen printing, stencilling or
pressure-syringe dispensing before package placement.
Several techniques exist for reflowing; for example,
thermal conduction by heated belt. Dwell times vary
between 50 and 300 seconds depending on heating
method. Typical reflow temperatures range from
215 to 250 °C.
Preheating is necessary to dry the paste and evaporate
the binding agent. Preheating duration: 45 minutes at
45 °C.
Wave soldering
Wave soldering techniques can be used for all VSO
packages if the following conditions are observed:
• A double-wave (a turbulent wave with high upward
pressure followed by a smooth laminar wave) soldering
technique should be used.
• The longitudinal axis of the package footprint must be
parallel to the solder flow.
• The package footprint must incorporate solder thieves at
the downstream end.
During placement and before soldering, the package must
be fixed with a droplet of adhesive. The adhesive can be
applied by screen printing, pin transfer or syringe
dispensing. The package can be soldered after the
adhesive is cured.
Maximum permissible solder temperature is 260 °C, and
maximum duration of package immersion in solder is
10 seconds, if cooled to less than 150 °C within
6 seconds. Typical dwell time is 4 seconds at 250 °C.
A mildly-activated flux will eliminate the need for removal
of corrosive residues in most applications.
Repairing soldered joints
Fix the component by first soldering two diagonally-
opposite end leads. Use only a low voltage soldering iron
(less than 24 V) applied to the flat part of the lead. Contact
time must be limited to 10 seconds at up to 300 °C. When
using a dedicated tool, all other leads can be soldered in
one operation within 2 to 5 seconds between
270 and 320 °C.
1997 Apr 16
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet PCF1172CU.PDF ] | |
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