2002 Microchip Technology Inc. DS21410B-page 1
TC3401
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
300µA; Sleep: 50µA
• microPort™ Serial Bus Requires only two
Interface Lines
• Uses Internal or External Reference
• Automatically Enters Sleep Mode when not in use
• True Differential Inputs with Built-In Multiplexer
Provide Ratiometric Conversions
• Early Warning Power Fail Detector, also suitable as
Wake-Up Timer Operational in Shutdown Mode
•V
DD
Monitor and Reset Generator Operational in
Shutdown Mode
Applications
• Consumer Electronics, Thermostats, CO
Monitors, Humidity Meters, Security Sensors
• Embedded Systems, Data Loggers,
Portable Equipment
• Medical Instruments
Device Selection Table
Package Type
General Description
The TC3401 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 TC3401 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. A V
DD
monitor with
a reset generator provides Power-on Reset and Brown-
out protection while an extra threshold detector is suit-
able for use as an early warning Power Fail detector, or
as a Wake-up Timer.
The TC3401’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 t
4
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.
TheTC3401isavailableina16-PinPDIPanda16-Pin
QSOP package.
Part
Number
Package
Temperature
Range
TC3401VPE 16-Pin PDIP (Narrow) 0°Cto+85°C
TC3401VQR 16-PinQSOPNarrow) 0°Cto+85°C
16-Pin PDIP
16-Pin QSOP
1
16
215
314
413
512
611
710
RESET
IN2-
89
IN1
+
IN1-
V
TH
REF
IN
GND
ADDR
V
DD
ENABLE
PFO
SDAT
REF
OU
IN2+
TC3401
SCLK
PFI
16-Bit Low Cost, Low Power Sigma-Delta A/D Converter
