TC7106ACKW Microchip Technology, TC7106ACKW Datasheet - Page 12

• Manufacturer Part Number: TC7106ACKW
• Description: IC ADC 3 1/2DGT LCD DVR 44-MQFP
• Manufacturer: Microchip Technology

Specifications of TC7106ACKW

• Display Type: LCD
• Configuration: 7 Segment
• Digits Or Characters: A/D 3.5 Digits
• Current - Supply: 800µA
• Voltage - Supply: 9V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 44-MQFP, 44-PQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Interface: -

TC7106/A/TC7107/A
6.0
Figure 6-2
designed to drive common anode LEDs. It is identical
to the TC7106A, except that the regulated supply and
backplane drive have been eliminated and the segment
drive is typically 8 mA. The 1000’s output (Pin 19) sinks
current from two LED segments, and has a 16 mA drive
capability.
In both devices, the polarity indication is “ON” for
negative analog inputs. If V
this indication can be reversed also, if desired.
The display font is the same as the TC7106A.
6.1
The oscillator frequency is divided by 4 prior to clocking
the
measurement cycle takes a total of 4000 counts, or
16,000 clock pulses. The 4000-count cycle is indepen-
dent of input signal magnitude.
Each phase of the measurement cycle has the
following length:
1.
For signals less than full scale, the auto-zero phase is
assigned the unused reference integrate time period:
2.
This time period is fixed. The integration period is:
EQUATION 6-1:
3.
The TC7106A/TC7107A are drop-in replacements for
the TC7106/TC7107 parts. External component value
changes are not required to benefit from the low drift
internal reference.
DS21455D-page 12
Where:
F
Auto-zero phase: 1000 to 3000 counts (4000 to
12000 clock pulses).
Signal integrate: 1000 counts (4000 clock
pulses).
Reference Integrate: 0 to 2000 counts (0 to 8000
clock pulses).
OSC
internal
DIGITAL SECTION (TC7107A)
System Timing
shows a TC7106A block diagram. It is
=
decade
T
Externally set clock frequency
SI
=
------------ -
F
counters.
OSC
4
IN
- and V
×
1000
IN
The
+ are reversed,
four-phase
6.2
Three clocking methods may be used (see
1.
2.
3.
FIGURE 6-1:
EXT
OSC
An external oscillator connected to Pin 40.
A crystal between Pins 39 and 40.
An RC oscillator using all three pins.
Clock Circuit
RC Network
40
Crystal
To TEST Pin on TSC7106A
To GND Pin on TSC7107A
TC7106A
TC7107A
Clock Circuits.
© 2008 Microchip Technology Inc.
39
38
µ
4
Figure
To
Counter
6-1):