TLC532A Datasheet, PDF (3/10 Pages) Texas Instruments – LinCMOSE 8-BIT ANALOG-TO-DIGITAL PERIPHERALS WITH 5 ANALOG AND 6 DUAL-PURPOSE INPUTS

TLC532AI, TLC532AM, TLC533AI, TLC533AM
LinCMOS™ 8-BIT ANALOG-TO-DIGITAL PERIPHERALS
WITH 5 ANALOG AND 6 DUAL-PURPOSE INPUTS
SLAS070 – D2819, NOVEMBER 1983 – REVISED SEPTEMBER 1986
functional description (continued)
A conversion cycle starts after a 2-byte instruction is written to the control register and the start conversion (SC)
bit is a logic high. This 2-byte instruction also selects the input analog channel to be converted. The status (EOC)
bit in the analog conversion data register is reset, and it remains reset until the conversion is complete, at which
time the status bit is set again. After conversion, the results are loaded into the analog conversion data register.
These results remain in the analog conversion data register until the next conversion cycle is complete. If a new
conversion command is entered into the control register while the conversion cycle is in progress, the on-going
conversion is aborted and a new channel acquisition cycle begins immediately.
The reset input R allows the device to be externally forced to a known state. When a low level is applied to the
R input for a minimum of three clock periods, the SC bit is cleared. The A/D converter is then idled and all the
outputs are placed in the high-impedance off-state. However, the content of the analog conversion data register
is not affected by the R input going to a low level.
Detailed information on interfacing to most popular microprocessors is readily available from the factory.
functional block diagram
Data Bus
(2 ^{– 8} – 2 ^{– 1)}
8
R/W
CS
Data Bus
RS
Control Logic
R
CLOCK
8
8
8
Analog/Digital Input
(A10/D1 – A15/D6)
External Analog Input
(A0, A2 – A5)
REF +
REF –
Digital Data
Register
6
(Read Only)
Control
Register
(Write Only)
6
4
Analog MUX
6
Address
5
11
12-Channel
Multiplexer
Sample
and Hold
A1
Analog Conversion
Register
(Read Only)
8
8-Bit Analog-to-Digital
Converter
(Switched Capacitors)
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