SC7106CPL View Datasheet(PDF) - Silan Microelectronics
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SC7106CPL Datasheet PDF : 21 Pages
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SC7106/7107
FIGURE 5. SIMPLE INVERTER FOR FIXED
FIGURE 6. EXCLUSIVE 'OR' GATE FOR DECIMAL
DECIMAL POINT
POINT DRIVE
The second function is a "lamp test". When TEST is pulled high (to V+) all segments will be turned on and the
display should read "1888". The TEST pin will sink about 15mA under these conditions.
NOTE: In the lamp test mode, the segments have a constant DC voltage (no square-wave). This may burn the
LCD display if maintained for extended periods.
9.DIGITAL SECTION
Figures 7 and 8 show the digital section for the SC7106 and SC7107, respectively. In the SC7106, an internal
digital ground is generated from a 6V Zener diode and a large P-Channel source follower. This supply is made
stiff to absorb the relative large capacitive currents when the back plane (BP) voltage is switched. The BP
frequency is the clock frequency divided by 800. For three readings/sec., this is a 60Hz square wave with a
nominal amplitude of 5V. The segments are driven at the same frequency and amplitude and are in phase with
BP when OFF, but out of phase when ON. In all cases negligible DC voltage exists across the segments.
Figures 8 is the Digital Section of the SC7107. It is identical to the SC7106 except that the regulated supply
and back plane drive have been eliminated and the segment drive has been increased from 2mA to 8mA, typical
for instrument size common anode LED displays. Since the 1000 output (pin 19) must sink current from two LED
segments it has twice the drive capability or 16mA.
In both devices, the polarity indication is "on" for negative analog inputs. If IN LO and IN HI are reversed, this
indication can be reversed also, if desired.
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:1.2 2006.02.27
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