TC3403
+1.8V Low Power, Quad Input, 16-Bit Sigma-Delta A/D Converter
with a Power Fault Monitor and Microprocessor Reset Circuit
Features
鈥?16-bit Resolution at Eight Conversions Per
Second, Adjustable Down to 10-bit Resolution at
512 Conversions Per Second
鈥?1.8V 鈥?5.5V Operation, Low Power Operating
280碌A(chǔ); Sleep: 93碌A(chǔ)
鈥?Four Single-ended Inputs with Built-in Multiplexer
鈥?microPort鈩?Serial Bus Requires only two
Interface Lines
鈥?Uses Internal or External Reference
鈥?Automatically Enters Sleep Mode when not in use
鈥?V
DD
Monitor and Reset Generator Operational in
Shutdown Mode
鈥?Early Warning Power Fail Detector, also suitable as
Wake-Up Timer Operational in Shutdown Mode
Package Type
16-Pin PDIP
16-Pin QSOP
IN1+
IN2+
IN3+
IN4+
PFI
V
TH
REF
IN
GND
1
2
3
4
5
6
7
8
16
15
14
V
DD
SCLK
A0
A1
RESET
PFO
SDAT
REF
OUT
TC3403
13
12
11
10
9
Applications
鈥?Consumer Electronics, Thermostats, CO
Monitors, Humidity Meters, Security Sensors
鈥?Embedded Systems, Data Loggers,
Portable Equipment
鈥?Medical Instruments
General Description
The TC3403 is a low cost, low power analog-to-digital
converter based on Microchip鈥檚 Sigma-Delta technol-
ogy. It will perform 16-bit conversions (15-bit plus sign)
at up to eight per second. The TC3403 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
suitable for use as an early warning Power Fail
detector, or as a Wake-up Timer.
The TC3403鈥檚 2-wire microPort鈩?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.
The TC3403 is available in a 16-Pin PDIP and a 16-Pin
QSOP package.
Device Selection Table
Part
Number
TC3403VPE
Package
16-Pin PDIP (Narrow)
Temperature
Range
0擄C to +85擄C
0擄C to +85擄C
TC3403VQR 16-Pin QSOP Narrow)
2002 Microchip Technology Inc.
DS21412B-page 1
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