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參數(shù)資料
| 型號： | TC815 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 3-1/2 Digit Auto-Ranging A/D Converter with Triplex LCD Drive and Display Hold Function |
| 中文描述： | 3-1/2數(shù)字自動測距的A / D三層液晶顯示驅(qū)動器和轉(zhuǎn)換器保持功能 |
| 文件頁數(shù)： | 22/26頁 |
| 文件大?。?/td> | 595K |
| 代理商： | TC815 |
TC815
DS21474B-page 22
2002 Microchip Technology Inc.
For a 3.1V integrator swing, the value of R
BUF is
easily calculated:
V
INT
t
I
C
I
R
X
MAX
V
X
MAX
= Integrator swing = 3.1V
= Integration time = 100msec
= Integration capacitor = 0.1μF
= 300
= 700mV
EQUATION 11-3:
FIGURE 11-2:
R
CALCULATION (200
MANUAL OPERATION)
With a low battery voltage of 6.6V, analog common will
be approximately 3.6V above the negative supply ter-
minal. With the integrator swinging down from analog
common toward the negative supply, a 3.1V swing will
set the integrator output to 0.5V above the negative
supply.
11.4
Capacitors - C
INT
, C
AZ
and C
REF
The integration capacitor, C
INT
, must have low dielec-
tric absorption. A 0.1μF polypropylene capacitor is sug-
gested. The auto-zero capacitor, C
AZ
, and reference
capacitor, C
REF
, should be selected for low leakage
and dielectric absorption. Polystyrene capacitors are
good choices.
11.5
Reference Voltage Adjustment
The TC815 contains a low temperature drift internal
voltage reference. The analog common potential
(Pin 29) is established by this reference. Maximum drift
is a low 75ppm/°C. Analog common is designed to be
approximately 2.6V below V
CC
(Pin 28). A resistive
divider (R18/R19, Functional Diagram) sets the TC815
reference input voltage (REFHI, Pin 34) to approxi-
mately 163.85mV.
With an input voltage near full scale on the 200mV
range, R19 is adjusted for the proper reading.
11.6
Display Hold Feature
The LCD will not be updated when HOLD (Pin 60) is
connected to GND (Pin 58). Conversions are made, but
the display is not updated. A HOLD mode LCD annun-
ciator is activated when HOLD is low.
The LCD HOLD annunciator is activated through the
triplex LCD driver signal at Pin 13.
11.7
Flat Package Socket
Sockets suitable for prototype work are available. A
USA source is:
Nepenthe Distribution
2471 East Bayshore, Suite 520
Palo Alto, CA 94303
(415) 856-9332
TWX: 910-373-2060
“CBQ” Socket, Part No. IC51-064-042
11.8
Resistive Ladder Networks
Resistor attenuator networks for voltage and resistance
measurements are available from:
Caddock Electronics
1717 Chicago Avenue
Riverside, CA 92507
Tel: (714) 788-1700
TWX: 910-332-6108
TABLE 11-2:
RESISTIVE LADDER
NETWORKS
R
BUF =
V
X
MAX
(T
I
)
C
I
(V
INT
)
= 200k
163.85
220
300
R
S
≈
600
SW33
R
1
R
2
R
3
V
X
Analog Common = V
CC
– 3V
V
CC
= 9V
Attenuator
Accuracy
Attenuator Type
Caddock
Part Number
0.1%
0.25%
0.25%
Voltage
Voltage
Resistance
1776-C441
1776-C44
T1794-204-1
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