參數(shù)資料
型號(hào)： 8XC51FB
廠(chǎng)商： NXP Semiconductors N.V.
英文描述： Low power single card reader
中文描述： 低功耗單卡讀卡器
文件頁(yè)數(shù)： 45/58頁(yè)
文件大?。?/td> 233K
代理商： 8XC51FB
2003 Oct 30
45
Philips Semiconductors
Product specification
Low power single card reader
TDA8029
When in Power-down or Sleep mode, card extraction or
insertion, overcurrent on V
CC
, or HIGH level on pins RST
or RESET will wake up the chip.
The same occurs in case of a falling edge on RX if bit
ENRX is set, or on INT1_N if bit ENINT1 is set and if
INT1_N is enabled within the controller.
IfonlyINT1_Nshouldwake upthe TDA8029, thenINT1_N
must be enabled in the controller, and ENINT1 only should
be set.
If RX should wake up the TDA8029, then INT1_N must be
enabled in the controller, and ENRX and ENINT1 should
be set.
In case of wake up by RX, then the first received
characters may be lost, depending on the baud rate on the
serial link. (The controller waits for 1536 clock cycles
before leaving Power-down mode).
For more details about the use of these modes, please
refer to the application notes “AN00069”and “AN01005”
8.16
Activation sequence
When the card is inactive, V
CC
, CLK, RST and I/O are
LOW, with low impedance with respect to GNDC. The
DC/DC converter is stopped.
When everything is satisfactory (voltage supply, card
present and no hardware problems), the system controller
may initiate an activation sequence of the card. Figure 12
shows the activation sequence.
After leaving the UART reset mode, and then configuring
the necessary parameters for the UART, it may set the bit
START in register PCR (t
0
). The following sequence will
take place:
The DC/DC converter is started (t
1
)
V
CC
starts rising from 0 to 5 V or 3 V with a controlled
rise time of 0.17 V/
μ
s typically (t
2
)
I/O rises to V
CC
(t
3
), (Integrated 14 k
pull-up to V
CC
)
CLK is sent to the card and RST is enabled (t
4
).
Afteranumberofclockpulsesthatcanbecountedwiththe
time out counter, bit RSTIN may be set by software, then
pin RST rises to V
CC
.
The sequencer is clocked by
1
/
64
f
int
which leads to a time
interval T of 25
μ
s typical. Thus t
1
= 0 to
3
/
64
T,
t
2
= t
1
+
3
/
2
T, t
3
= t
1
+
7
/
2
T, and t
4
= t
1
+ 4T.
handbook, full pagewidth
START
VUP
VCC
I/O
RSTIN
CLK
RST
t0
t2
t3
t4 = tact
ATR
t1
FCE684
Fig.12 Activation sequence.
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