资料介绍
A Microchip Technology analog-to-digital converter, a 2K-byte
CMOS static RAM, and some gates and counters can be
combined to form a low-cost, flexible, standalone data logging
system. All the ICs are CMOS and the clock frequency is low, so
power supply current is only a couple of milliamperes. The unit
will store a 13-bit conversion (12-bit plus sign) in two consecu-
tive bytes of memory, with a programmable time interval
between measurements. The circuit is useful for logging
temperature or other process control variables in remote loca-
tions or hostile environments. It is also useful in the lab for
making unattended, repetitive measurements of long-term drift,
component aging, etc. AN796
TC7109 Records Remote Data Automatically
goes low for one clock cycle. After CE/LOAD goes high, the low
Author: Wes Freeman,
byte of the conversion is latched into memory, IC6 is again
Microchip Technology, Inc.
incremented, LBEN goes high, and the data outputs return to
their high- impedance state.
INTRODUCTION Data can
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