CLRC632 Datasheet, PDF (94/163 Pages) NXP Semiconductors – Multiple Protocol Contactless Reader IC

Philips Semiconductors
Multiple Protocol Contactless Reader IC
Product Specification Rev. 3.0; May 2003
CL RC632
10.3 Stand By Mode
The Stand By-mode is entered immediately by setting bit StandBy in the Control-Register. All internal current
sinks are switched off (including the internal digital clock buffer but except the oscillator buffer).
Different from the Hard Power Down-Mode, the digital input-buffers are not separated by the input pads and
keep their functionality. The digital output pins do not change their state.
Different from the Soft Power Down-Mode, the oscillator does not need time to wake up.
After resetting bit StandBy in the Control-Register it needs 4 clocks on pin OSCIN until the Stand By-Mode is
left indicated by the StandBy bit itself. Resetting it does not immediately clear it. It is cleared automatically by
the CL RC632 when the Stand By-Mode is left.
10.4 Receiver Power Down
It is power saving to switch off the receiver circuit when it is not needed and switched it on again right before
data is to be received from the card. This is done automatically by setting bit RxAutoPD to 1. If it is set to 0
the receiver is continuously switched on.
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