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TC3403 Fiches technique(PDF) 5 Page - Microchip Technology

No de pièce TC3403
Description  1.8V Low Power, Quad Input, 16-Bit Sigma-Delta A/D Converter with a Power Fault Monitor and Microprocessor Reset Circuit
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Fabricant  MICROCHIP [Microchip Technology]
Site Internet  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC3403 Fiches technique(HTML) 5 Page - Microchip Technology

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© 2005 Microchip Technology Inc.
DS21412C-page 5
TC3403
2.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1:
PIN FUNCTION TABLE
Pin No.
(16-Pin PDIP)
(16-Pin QSOP)
Symbol
Description
1
IN1+
Analog Input. This is the positive terminal of a true differential input with the negative input
tied internally to GND. See Section 1.0, Electrical Characteristics.
2
IN2+
Analog Input. This is the positive terminal of a true differential input with the negative input
tied internally to GND. See Section 1.0, Electrical Characteristics.
3
IN3+
Analog Input. This is the positive terminal of a true differential input with the negative input
tied internally to GND. See Section 1.0, Electrical Characteristics.
4
IN4+
Analog Input. This is the positive terminal of a true differential input with the negative input
tied internally to GND. See Section 1.0, Electrical Characteristics.
5
PFI
Analog Input. This is the positive input to an internal comparator used as a threshold detector.
The negative input is tied to an internal reference.
6VTH
Analog Input. This is the positive input to the internal comparator used to monitor the voltage
supply. The negative input is tied to an internal reference. When VTH falls below the internal
reference, the reset generator drives RESET low. See Section 1.0, Electrical Characteristics.
7REFIN
Analog Input. The converter’s reference voltage is the differential between this pin and ground
times two. It may be tied directly to REFOUT or scaled using a resistor divider.
Any user supplied reference voltage less than 1.25 may be used in place of REFOUT.
8
GND
Ground Terminal.
9REFOUT
Analog Output. The internal reference connects to this pin. It may be scaled externally and
tied to the REFIN input to provide the converter’s reference voltage. Care must be taken in
connecting external circuitry to this pin. This pin is in a high impedance state during Sleep
mode.
10
SDAT
Digital Output (push-pull). This is the microPort™ serial data output. SDAT is driven low while
the TC3403 is converting data, effectively providing a “busy” signal. After the conversion is
complete, every high to low transition on the SCLK pin puts a bit from the resulting data word
on the SDAT pin (from MSB to LSB).
11
PFO
Digital Output (open drain). This is the output of the internal threshold detector.
When PFI is less than the internal reference, PFO is driven low.
12
RESET
Digital Output (open drain). This is the output of the VDD monitor reset generator. RESET is
driven low when a Power-on Reset or Brown-out condition is detected.
See Section 1.0, AC Electrical Characteristics.
13
A1
Digital Input. Controls analog multiplexer in conjunction with A0 to select one of the four Input
channels. This address is latched at the falling edge of the SCLK, which starts an A/D
conversion. A1, A0 = 00 = Input 1; 01 = Input 2; 10 = Input 3; 11 = Input 4.
14
A0
Digital Input. Controls analog multiplexer in conjunction with A1 to select one of four Input
channels. This address is latched at the falling edge of the SCLK, which starts an A/D
conversion. A1, A0 = 00 = Input 1; 01 = Input 2; 10 = Input 3; 11 = Input 4.
15
SCLK
Digital Input. This is the microPort™ serial clock input. The TC3403 comes out of Sleep mode
and a conversion cycle begins when this pin is driven low. After the conversion starts, each
additional falling edge (up to six) detected on SCLK for t4 seconds reduces the A/D resolution
by one bit. When the conversion is complete, the data word can be shifted out on the SDAT
pin by clocking the SCLK pin.
16
VDD
Power Supply Input.


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