TC3402 Datasheet, PDF (1/16 Pages) Microchip Technology – +1.8 Low Power, Quad Input, 16-Bit Sigma-Delta A/D Converter

TC3402
+1.8 Low Power, Quad Input, 16-Bit Sigma-Delta A/D Converter
Features
• 16-bit Resolution at Eight Conversions Per
Second, Adjustable Down to 10-bit Resolution at
512 Conversions Per Second
• 1.8V – 5.5V Operation, Low Power Operating
250µA; Sleep: 0.75µA
• Four True Differential Inputs with Built-in Multiplexer
• microPort™ Serial Bus Requires only two
Interface Lines
• Uses Internal or External Reference
• Automatically Enters Sleep Mode when not in use
Applications
• Consumer Electronics, Thermostats, CO
Monitors, Humidity Meters, Security Sensors
• Embedded Systems, Data Loggers,
Portable Equipment
• Medical Instruments
Device Selection Table
Part
Number
Package
Temperature
Range
TC3402VPE 16-Pin PDIP (Narrow) 0°C to +85°C
TC3402VQR 16-Pin QSOP Narrow) 0°C to +85°C
Package Type
16-Pin PDIP
16-Pin QSOP
IN1+ 1
IN1- 2
IN2+ 3
IN2- 4
IN3+ 5
IN3- 6
REF_IN 7
GND 8
TC3402
16 V_DD
15 SCLK
14 A0
13 A1
12 IN4+
11 IN4-
10 SDAT
9 REF_OUT
General Description
The TC3402 is a low cost, low power analog-to-digital
converter based on Microchip’s Sigma-Delta technol-
ogy. It will perform 16-bit conversions (15-bit plus sign)
at up to eight per second. The TC3402 is optimized for
use as a microcontroller peripheral in low cost, battery
operated systems. A voltage reference is included, or
an external reference can be used.
The TC3402’s 2-wire microPort™ digital interface is
used for starting conversions and for reading out the
data. Driving the SCLK line low starts a conversion.
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 and cuts conversion time
in half. After a conversion is completed, clocking the
SCLK line puts the MSB through LSB of the resulting
data word onto the SDAT line, much like a shift register.
The part automatically sleeps when not performing a
data conversion.
The TC3402 is available in a 16-Pin PDIP and a 16-Pin
QSOP package.
© 2002 Microchip Technology Inc.
DS21411B-page 1