TC7117CKW Microchip Technology, TC7117CKW Datasheet - Page 10

• Manufacturer Part Number: TC7117CKW
• Description: IC ADC 3 1/2DGT LED DVR 44-MQFP
• Manufacturer: Microchip Technology

Specifications of TC7117CKW

• Display Type: LED
• Configuration: 7 Segment
• Digits Or Characters: A/D 3.5 Digits
• Current - Supply: 800µA
• Voltage - Supply: 5V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 44-MQFP, 44-PQFP
• Resolution (bits): 3.5bit
• Input Channel Type: Differential
• Data Interface: Parallel
• Supply Voltage Range - Analog: 5V
• Supply Current: 800µA
• Digital Ic Case Style: QFP
• No. Of Pins: 44
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Interface: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

TC7116/A/TC7117/A
FIGURE 3-4:
Decimal Point Drive
3.2
Figure 3-5 and Figure show the digital section for
TC7116/TC7116A and TC7117/TC7117A, respectively.
For the TC7116/TC7116A (Figure 3-5), an internal dig-
ital ground is generated from a 6V Zener diode and a
FIGURE 3-5:
DS21457C-page 10
TC7116A
OSC1
TC7116
TEST
V+
40
Digital Section
Typical Segment Output
Internal Digital Ground
BP
Decimal
Select
OSC2
TC7116A
Point
0.5mA
2mA
Clock
TC7116
From Comparator Output
39
Exclusive “OR” Gate for
TC7116/TC7116A Digital Section
Segment
Output
To Switch Drivers
V+
OSC3
4030
GND
V+
38
Internal Digital Ground
Thousands
÷
To LCD
Decimal
Point
4
7-Segment
Hundreds
Decode
Logic Control
large P-channel source follower. This supply is made
stiff to absorb the relative large capacitive currents
when the backplane (BP) voltage is switched. The BP
frequency is the clock frequency 4800. For 3 readings
per second, 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.
Figure is the digital section of the TC7117/TC7117A. It
is identical to the TC7116/TC7116A, except that the
regulated supply and BP drive have been eliminated,
and the segment drive is typically 8mA. The 1000’s out-
put (Pin 19) sinks current from two LED segments, and
has a 16mA drive capability. The TC7117/TC7117A are
designed to drive common anode LED displays.
In both devices, the polarity indication is ON for analog
inputs. If V
be reversed also, if desired.
HLDR
LCD Phase Driver
1
7-Segment
Latch
Decode
IN
Tens
- and V
V
~70kΩ
TH
= 1V
IN
+ are reversed, this indication can
7-Segment
Decode
© 2006 Microchip Technology Inc.
Units
21
÷
500Ω
6.2V
200
Backplane
35
37
26
V-
V+
TEST