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參數資料
| 型號： | TC815CBUTR |
| 元件分類： | ADC |
| 英文描述： | 1-CH DUAL-SLOPE ADC, PQFP64 |
| 封裝： | PLASTIC, QFP-64 |
| 文件頁數： | 15/26頁 |
| 文件大?。?/td> | 575K |
| 代理商： | TC815CBUTR |
TC815
DS21474C-page 22
2005 Microchip Technology Inc.
For a 3.1V integrator swing, the value of R
ΩBUF is
easily calculated:
VINT
= Integrator swing = 3.1V
tI
= Integration time = 100msec
CI
= Integration capacitor = 0.1F
RXMAX
= 300
Ω
VX MAX
= 700mV
EQUATION 11-3:
FIGURE 11-2:
R
Ω CALCULATION (200Ω
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 - CINT, CAZ and CREF
The integration capacitor, CINT, must have low dielec-
tric absorption. A 0.1F polypropylene capacitor is sug-
gested. The auto-zero capacitor, CAZ, and reference
capacitor, CREF, 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 VCC (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
ΩBUF =
VXMAX(TI)
CI(VINT)
= 200k
Ω
163.85
Ω
220
Ω
300
Ω
RS ≈ 600Ω
SW33
R1
R2
R3
VX
Analog Common = VCC – 3V
VCC = 9V
Attenuator
Accuracy
Attenuator Type
Caddock
Part Number
0.1%
Voltage
1776-C441
0.25%
Voltage
1776-C44
0.25%
Resistance
T1794-204-1
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