User's Manual

10
Micro-reader - Reference Guide May ’00
1.3.1 Pin Connection Description
SYNC (1) Output for wired synchronization. This output is at GND level until
the Micro-reader starts its read cycle, at which time it goes to VSL
until the complete reading, programming or locking cycle is finished.
RDEN- (2) Input for wired synchronization. Taking this pin to VSL acts as a
hold-off for the Micro-reader's output stage preventing it from
transmitting until the input returns to GND. The Micro-reader only
samples this input at the start of its own reading, programming or
locking cycle, this means that if the input goes to VSL after a cycle
is started, the cycle is not interrupted. RDEN is a high impedance
input and must be tied to GND via a suitable resistor (27 kOhm)
when it is not being used.
When the Micro-reader is idle it is possible to trigger a single read by
taking the RDEN-pin logic high for 100 ms. The single read will start
on the falling edge of the 100 ms pulse.
RESET- (4) Taking this pin to GND holds the Micro-reader in reset. If the reset
pin is not used it can be left disconnected as it is internally pulled up.
Minimum pulse duration to perform a reset is 1 ms. After a reset the
14 -- Reserved, do not connect
15 GND Ground for logic
16 ANT1 Antenna terminal 1
17 ANTCAP Antenna capacitor terminal
18 -- Reserved, do not connect
19 ANT2 Antenna terminal 2
20
-- Reserved, do not connect
21
GNDP Ground for output stage
22
VSP Supply voltage output stage
23
-- Reserved, do not connect
24
VSL Supply voltage logic
25
GND Ground for logic
26
CRD Input for continuous read mode
27
WLS Input to switch wireless synchronization on
28
-- Reserved, do not connect
29
OKT Output to show if a valid ID was read
30
STAT Output to show status of RF-transmitter control signal
Table 1: Pin Connections
Pin Signal Name Function