參數(shù)資料
型號(hào)： MFRC50001T
廠商： NXP Semiconductors N.V.
元件分類： 通信及網(wǎng)絡(luò)
英文描述： Highly integrated ISO-IEC 14443 A reader IC
封裝： MFRC50001T/0FE<SOT287-1 (SO32)|<<http://www.nxp.com/packages/SOT287-1.html<1<week 15, 2005,;
文件頁數(shù)： 24/110頁
文件大?。?/td> 841K
代理商： MFRC50001T
MFRC500_33
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2010. All rights reserved.
Product data sheet
PUBLIC
Rev. 3.3 — 15 March 2010
048033
24 of 110
NXP Semiconductors
MFRC500
Highly Integrated ISO/IEC 14443 A Reader IC
9.6.2
Soft power-down mode
Soft power-down mode is entered immediately using the Control register bit PowerDown.
All internal current sinks, including the oscillator buffer, are switched off. The digital input
buffers are not separated from the input pads and keep their functionality. In addition, the
digital output pins do not change their state.
After resetting the Control register bit PowerDown, the bit indicating Soft power-down
mode is only cleared after 512 clock cycles. Resetting it does not immediately clear it. The
PowerDown bit is automatically cleared when the Soft power-down mode is exited.
Remark:
When the internal oscillator is used, time (t
osc
) is required for the oscillator to
become stable. This is because the internal oscillator is supplied by V
DDA
and any clock
cycles will not be detected by the internal logic until V
DDA
is stable.
9.6.3
Standby mode
The Standby mode is immediately entered when the Control register StandBy bit is set. All
internal current sinks, including the internal digital clock buffer are switched off. However,
the oscillator buffer is not switched off.
The digital input buffers are not separated by the input pads, keeping their functionality
and the digital output pins do not change their state. In addition, the oscillator does not
need time to wake-up.
After resetting the Control register StandBy bit, it takes four clock cycles on pin OSCIN for
Standby mode to exit. Resetting bit StandBy does not immediately clear it. It is
automatically cleared when the Standby mode is exited.
9.6.4
Automatic receiver power-down
It is a power saving feature to switch off the receiver circuit when it is not needed. Setting
bit RxAutoPD = logic 1, automatically powers down the receiver when it is not in use.
Setting bit RxAutoPD = logic 0, keeps the receiver continuously powered up.
RX
VMID
RSTPD
OSCOUT
29
30
31
32
I
A
I
O
not changed
pulled to V
DDA
not changed
HIGH
Table 19.
Symbol
Signal on pins during Hard power-down
…continued
Pin
Type
Description
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