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參數(shù)資料
| 型號： | 8XC51FB |
| 廠商： | 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 |
| 文件頁數(shù)： | 43/58頁 |
| 文件大?。?/td> | 233K |
| 代理商： | 8XC51FB |
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2003 Oct 30
43
Philips Semiconductors
Product specification
Low power single card reader
TDA8029
8.11
Supply
The circuit operates within a supply voltage range of
2.7 to 6 V. The supply pins are V
DD
, DCIN, GND and
PGND. Pins DCIN and PGND supply the analog drivers to
the cards and have to be externally decoupled because of
the large current spikes the card and the step-up converter
can create. V
DD
and GND supply the rest of the chip.
An integrated spike killer ensures the contacts to the card
to remain inactive during power-up or -down. An internal
voltage reference is generated which is used within the
step-up converter, the voltage supervisor, and the V
CC
generators.
V
DCIN
may be higher than V
DD
.
The voltage supervisor generates an alarm pulse, whose
length is defined by an external capacitor connected to the
CDEL pin, when V
DD
is too low to ensure proper operation
(1 ms per 2 nF typical). This pulse is used as a Power-on
reset pulse, and also to block either any spurious signals
on card contacts during controllers reset or to force an
automatic deactivation of the contacts in the event of
supply drop-out (see Sections 8.16 and 8.17).
After power-on or after a voltage drop, the bit SUPL is set
within the Hardware Status Register (HSR) and remains
set until HSR is read when the alarm pulse is inactive.
As long as the Power-on reset is active, INT0_N is LOW.
The same occurs when leaving shut-down mode or when
the RESET pin has been set active.
handbook, full pagewidth
Vth1
VDD
Vth2
CDEL
RSTOUT
SUPL
INT
Supply dropout
Power-off
Reset by CDEL
Power-on
Status read
MDB815
tw
Fig.11 Voltage supervisor.
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