TDA8029 Datasheet, PDF (43/59 Pages) NXP Semiconductors – Low power single card reader

Philips Semiconductors
TDA8029
Low power single card reader
• Current to or from pin CLK limited to 70 mA
• ESD protection on all card contacts and pin PRES at minimum 6 kV, thus no need of
extra components for protecting against ESD flash caused by a charged card being
introduced in the slot
• Short circuit between any card contacts can have any duration without any damage.
8.15 Power reduction modes
On top of the standard controller power reduction features described in the microcontroller
section, the TDA8029 has several power reduction modes that allow its use in portable
equipment, and help protecting the environment:
1. Shut-down mode: when SDWN_N pin is LOW, then the bit SDWN within HSR will be
set, causing an interrupt on INT0_N. The TDA8029 will read the status, deactivate the
card if it was active, set all ports to logic 1 and enter Power-down mode by setting bit
PD in the controller’s PCON register. In this mode, it will consume less than 20 µA,
because the internal oscillator is stopped, and all biasing currents are cut.
When SDWN_N returns to HIGH, a Power-on reset operation is performed, so the
chip is in the same state than at power-on.
2. Power-down mode: the microcontroller is in Power-down mode, and the card is
deactivated. The bias currents in the chip and the frequency of the internal oscillator
are reduced. In this mode, the consumption is less than 100 µA.
3. Sleep mode: the microcontroller is in Power-down mode, the card is activated, but
with the clock stopped HIGH or LOW. In this case, the card is supposed not to draw
more than 2 mA from V_CC. The bias currents and the frequency of the internal
oscillator are also reduced. With a current of 100 µA drawn by the card, the
consumption is less than 500 µA in tripler mode, 400 µA in doubler mode, or 300 µA
in follower mode.
When in Power-down or Sleep mode, card extraction or insertion, overcurrent on pins
RST or V_CC, or HIGH level on pin 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.
If only INT1_N should wake up the TDA8029, then INT1_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-to-DC converter is stopped.
9397 750 14145
Product data sheet
Rev. 03 — 22 February 2005
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
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