TC3403 MICROCHIP [Microchip Technology], TC3403 Datasheet - Page 5

• Manufacturer Part Number: TC3403
• Description: +1.8V Low Power, Quad Input, 16-Bit Sigma-Delta A/D Converter with a Power Fault Monitor and Microprocessor Reset Circuit
• Manufacturer: MICROCHIP [Microchip Technology]

2.0
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1:
©
2002 Microchip Technology Inc.
(16-Pin QSOP)
(16-Pin PDIP)
Pin No.
10
12
13
14
15
16
11
1
2
3
4
5
6
7
8
9
PIN DESCRIPTIONS
PIN FUNCTION TABLE
Symbol
REF
RESET
REF
SCLK
SDAT
GND
IN1+
IN2+
IN3+
IN4+
PFO
V
V
PFI
A1
A0
TH
DD
OUT
IN
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.
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.
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.
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.
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.
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 V
reference, the reset generator drives RESET low. See Section 1.0, Electrical Characteristics.
Analog Input. The converter’s reference voltage is the differential between this pin and ground
times two. It may be tied directly to REF
Any user supplied reference voltage less than 1.25 may be used in place of REF
Ground Terminal.
Analog Output. The internal reference connects to this pin. It may be scaled externally and
tied to the REF
connecting external circuitry to this pin. This pin is in a high impedance state during Sleep
mode.
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).
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.
Digital Output (open drain). This is the output of the V
driven low when a Power-on Reset or Brown-out condition is detected.
See Section 1.0, AC Electrical Characteristics.
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.
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.
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 t
by one bit. When the conversion is complete, the data word can be shifted out on the SDAT
pin by clocking the SCLK pin.
Power Supply Input.
IN
input to provide the converter’s reference voltage. Care must be taken in
OUT
Description
or scaled using a resistor divider.
DD
4
monitor reset generator. RESET is
seconds reduces the A/D resolution
TH
falls below the internal
TC3403
DS21412B-page 5
OUT
.