TDA8034T Philips Semiconductors, TDA8034T Datasheet - Page 12

• Manufacturer Part Number: TDA8034T
• Description: Smart Card Interface
• Manufacturer: Philips Semiconductors

NXP Semiconductors
TDA8034T_TDA8034AT_1
Product data sheet
Fig 9.
(1) Deactivation caused by card withdrawal.
(2) Deactivation caused by short-circuit.
Operation of debounce feature with pins OFFN, CMDVCCN, PRESN and V
CMDVCCN
8.10 Automatic determining of card supply voltage
PRESN
OFFN
V
CC
The supply voltage (V
the duration of the HIGH state (logic 1) on pin CMDVCCN before the activation command
(CMDVCCN falling edge) occurs. If pin CMDVCCN stays HIGH for more than 30 ms,
activation occurs with V
activation occurs with V
To activate the card at V
going LOW (logic 0).
To activate the card at V
going LOW (logic 0).
If pin CMDVCCN is HIGH for more than 15 ms (t0 > 15 ms) but less than 30 ms, pin
CMDVCCN must be set LOW for t1 (200 s < t1 < 700 s), and then HIGH for t2
(200 s < t2 < 15 ms) before going LOW.
Fig 10. Card activation, V
Fig 11. Card activation, V
CMDVCCN
CMDVCCN
t
deb
CC
Rev. 01 — 5 February 2010
V
V
CC
CC
CC
CC
) that the card requires is determined automatically by monitoring
CC
CC
set to 5 V. If pin CMDVCCN stays HIGH for less than 15 ms,
set to 3 V.
CC
CC
= 5 V, pin CMDVCCN must stay HIGH for t0 > 30 ms before
= 3 V, pin CMDVCCN must stay HIGH for t0 < 15 ms before
3 V or 5 V
3 V or 5 V
= 5 V, t0 > 30 ms
= 3 V, t0 < 15 ms
(1)
TDA8034T; TDA8034AT
t0
t0
t
deb
CC
5 V
3 V
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(2)
Smart card interface
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© NXP B.V. 2010. All rights reserved.
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