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PDF TC835CKW Data sheet ( Hoja de datos )
| Número de pieza | TC835CKW | |
| Descripción | Personal Computer Data Acquisition A/D Converter | |
| Fabricantes | Microchip Technology | |
| Logotipo |  |
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TC835
Personal Computer Data Acquisition A/D Converter
Features
• Upgrade of Pin-Compatible TC7135, ICL7135
• 200kHz Operation
• Single 5V Operation With TC7660
• Multiplexed BCD Data Output
• UART and Microprocessor Interface
• Control Outputs for Auto-Ranging
• Input Sensitivity: 100µV
• No Sample and Hold Required
Applications
• Personal Computer Data Acquisition
• Scales, Panel Meters, Process Controls
• HP-IL Bus Instrumentation
Device Selection Table
Part Number Package Temperature Range
TC835CBU 64-PinPQFP
0°C to +70°C
TC835CKW 44-PinPQFP
0°C to +70°C
TC835CPI 28-Pin PDIP
0°C to +70°C
Note: Tape and Reel available for 44-Pin PQFP
package.
General Description
The TC835 is a low power, 4-1/2 digit (0.005%
resolution), BCD analog to digital converter (ADC) that
has been characterized for 200kHz clock rate opera-
tion. The five conversions per second rate is nearly
twice as fast as the ICL7135 or TC7135. The TC835,
like the TC7135, does not use the external diode resis-
tor rollover error compensation circuits required by the
ICL7135.
The multiplexed BCD data output is perfect for interfac-
ing to personal computers. The low cost, greater than
14-bit high-resolution and 100µV sensitivity makes the
TC835 exceptionally cost-effective.
Microprocessor-based data acquisition systems are
supported by the BUSY and STROBE outputs, along
with the RUN/HOLD input of the TC835. The
OVERRANGE, UNDERRANGE, BUSY and RUN/
HOLD control functions, plus multiplexed BCD data
outputs, make the TC835 the ideal converter for µP-
based scales, measurement systems and intelligent
panel meters.
The TC835 interfaces with full function LCD and LED
display decoder/drivers. The UNDERRANGE and
OVERRANGE outputs may be used to implement an
auto-ranging scheme or special display functions.
© 2002 Microchip Technology Inc.
DS21478B-page 1
1 page  
TC835
TC835 ELECTRICAL SPECIFICATIONS (CONTINUED)
Electrical Characteristics: TA = +25°C, FCLOCK = 200kHz, V+ = +5V, V- = -5V, unless otherwise specified.
Symbol
Parameter
Min Typ Max
Unit
Test Conditions
Power Supply
V+ Positive Supply Voltage
456
V
V– Negative Supply Voltage
-3 -5 -8
V
I+ Positive Supply Current
—1
3
mA fCLK = 0Hz
I– Negative Supply Current
— 0.7
3
mA fCLK = 0Hz
PD Power Dissipation
— 8.5 30
mΩ fCLK = 0Hz
Note 1: Functional operation is not implied.
2: Limit input current to under 100 µA if input voltages exceed supply voltage.
3: Full scale voltage = 2V.
4: VIN = 0V.
5: 0°C ≤ TA ≤ +70°C.
6: External reference temperature coefficient less than 0.01ppm/°C.
7: -2V ≤ VIN ≤ +2V. Error of reading from best fit straight line.
8: |VIN| = 1.9959.
9: Test circuit shown in Figure 1-1.
10: Specification related to clock frequency range over which the TC835 correctly performs its various functions. Increased
errors result at higher operating frequencies.
© 2002 Microchip Technology Inc.
DS21478B-page 5
5 Page 
FIGURE 5-2:
TIMING DIAGRAMS FOR
OUTPUTS
Integrator
Output
Signal
System Integrate
Zero 10,000
10,001 Counts
Counts (Fixed)
Reference
Integrate
20,001
Counts (Max)
Full Measurement Cycle
40,002 Counts
Busy
Overrange when
Applicable
Underrange when
Applicable
Expanded Scale Below
Digit Scan
100
Counts
STROBE
Auto Zero
Digit Scan * D5
for Overrange
D4
D3
D2
D1
D5
D4
D3
D2
D1
* First D5 of System Zero and
Reference Integrate One Count
Longer
Signal
Integrate
Reference
Integrate
*
5.1 RUN/HOLD Input (Pin 25)
When left open, this pin assumes a logic "1" level. With
a RUN/HOLD = 1, the TC835 performs conversions
continuously, with a new measurement cycle beginning
every 40,002 clock pulses.
When RUN/HOLD changes to a logic "0," the measure-
ment cycle in progress will be completed, and data held
and displayed as long as the logic "0" condition exists.
A positive pulse (>300nsec) at RUN/HOLD initiates a
new measurement cycle. The measurement cycle in
progress when RUN/HOLD initially assumed the logic
"0" state must be completed before the positive pulse
can be recognized as a single conversion run
command.
The new measurement cycle begins with a 10,001-
count auto zero phase. At the end of this phase, the
busy signal goes high.
TC835
5.2 STROBE Output (Pin 26)
During the measurement cycle, the STROBE control
line is pulsed low five times. The five low pulses occur
in the center of the digit drive signals (D1, D2, D3, D5)
(see Figure 5-3).
D5 (MSD) goes high for 201 counts when the measure-
ment cycles end. In the center of the D5 pulse, 101
clock pulses after the end of the measurement cycle,
the first STROBE occurs for one-half clock pulse. After
the D5 digit strobe, D4 goes high for 200 clock pulses.
The STROBE goes low 100 clock pulses after D4 goes
high. This continues through the D1 digit drive pulse.
The digit drive signals will continue to permit display
scanning. STROBE pulses are not repeated until a new
measurement is completed. The digit drive signals will
not continue if the previous signal resulted in an
overrange condition.
The active low STROBE pulses aid BCD data transfer
to UARTs, processors and external latches.
FIGURE 5-3:
STROBE SIGNAL LOW
FIVE TIMES PER
CONVERSION
TC835
Outputs
Busy
End of Conversion
*
B1–B8
D5 (MSD) D4
Data Data
D3
Data
D2 D1 (LSD) D5
Data Data Data
STROBE
200
Counts
Note Absence of
STROBE
D5
201
Counts
200
Counts
D4 200
Counts
D3 200
Counts
D2 200
Counts
D1 200
Counts
*Delay between Busy going Low and First STROBE pulse is
dependent on Analog Input.
5.3 BUSY Output
At the beginning of the signal integration phase, BUSY
goes high and remains high until the first clock pulse
after the integrator zero crossing. BUSY returns to the
logic "0" state after the measurement cycle ends in an
overrange condition. The internal display latches are
loaded during the first clock pulse after BUSY and are
latched at the clock pulse end. The BUSY signal does
not go high at the beginning of the measurement cycle,
which starts with the auto zero cycle.
© 2002 Microchip Technology Inc.
DS21478B-page 11
11 Page | ||
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| PDF Descargar | [ Datasheet TC835CKW.PDF ] | |
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