SLRC40001T/OFE,112 NXP Semiconductors, SLRC40001T/OFE,112 Datasheet - Page 75

• Manufacturer Part Number: SLRC40001T/OFE,112
• Description: IC I.CODE SLRC400 READER 32-SOIC
• Manufacturer: NXP Semiconductors
• Series: I-Coder

Specifications of SLRC40001T/OFE,112

• Rf Type: Read Only
• Frequency: 13.56MHz
• Features: ISO15693, ISO18000-3
• Package / Case: 32-SOIC (0.300", 7.50mm Width)
• Product: RFID Readers
• Operating Temperature Range: - 25 C to + 85 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: 568-1124-5; 935269551112; SLRC400; SLRC41TOFED

Philips Semiconductors
I•CODE Reader IC
9.2.2
The main part of the timer unit is a down-counter. As long as the down-counter value is unequal zero, it
decrements its value with each timer clock.
If TAutoRestart is enabled the timer does not decrement down to zero. Having reached the value 1 the timer
reloads with the next clock with the TimerReload value.
The timer is started by loading a value from the TimerReload Register into the counter module. This may be
triggered by one of the following events:
•
•
•
•
Note: Every start-event re-loads the timer from the TimerReload Register. Thus, the timer unit is re-triggered.
The timer can be configured to stop with one of the following events:
•
•
•
•
Loading a new value, e.g. zero, into the TimerReload Register does not immediately influence the counter,
since the TimerReload Register affects the counter units content only with the next start-event. Thus, the
TimerReload Register may be changed even if the timer unit is already counting. The consequence of
changing the TimerReload Register will be visible after the next start-event.
If the counter is stopped by setting bit TStopNow, no TimerIRq is signalled.
9.2.3
The clock of the timer unit is derived from the 13.56 MHz chip clock via a programmable divider. The clock
selection is done with the TPreScaler Register, that defines the timer unit clock frequency according to the
following formula:
The possible values for the TPreScaler Register range from 0 up to 21. This results in minimum time
T
The time period elapsed since the last start event is calculated with
This results in a minimum time T
TimerClock
Transmission of the first bit to the label (TxBegin Event) and bit TStartTxBegin is 1
Transmission of the last bit to the label (TxEnd Event) and bit TStartTxEnd is 1
The counter module decrements down to zero and bit TAutoRestart is 1
Bit TStartNow is set to 1 (by the µ-Processor)
Reception of the first valid bit from the label (RxBegin Event)and bit TStopRxBegin is set to 1
Reception of the last bit from the label (RxEnd event) and bit TStopRxEnd is set to 1
The counter module has decremented down to zero and bit TAutoRestart is set to 0
Bit TStopNow is set to 1 (by the µ-Processor)
CONTROLLING THE TIMER UNIT
TIMER UNIT CLOCK AND PERIOD
of about 74 ns up to about 150 ms.
Timer
T
Timer
T
of about 74 ns up to about 40 s.
TimerClock
=
TReLoadVal
=
f
TimerClock
1
75
f
TimerClock
ue
=
−
13
TimerValue
2
T
.
56
Pr
Product Specification Rev. 3.1 August 2004
eScaler
MHz
SL RC400