tda8035hn NXP Semiconductors, tda8035hn Datasheet - Page 14

• Manufacturer Part Number: tda8035hn
• Description: Smart Card Interface
• Manufacturer: NXP Semiconductors

NXP Semiconductors
TDA8035HN
Product data sheet
8.8 Deactivation sequence
8.9 VCC regulator
When a session is completed, the micro-controller sets the CMDVCCN line to the HIGH
state. The circuit then executes an automatic deactivation sequence by counting the
sequencer back and ends in the inactive state (see
V
35 mA at Vcc =1.8 V .
It has an internal overload detection at approximately 125 mA.
This detection is internally filtered, allowing spurious current pulses of some ms up to
200 mA to be drawn by the card without causing a deactivation. (The average current
value must stay below maximum).
1. RST goes LOW (t
2. CLK is stopped LOW (t
3. I/O, AUX1 and AUX2 are pulled LOW (t
4. V
5. VUP falls to zero (t
6. V
7. All card contacts become low-impedance to GND (I/OUC, AUX1UC and AUX2UC
8. The internal oscillator goes back to its lower frequency.
Fig 9.
CC
reaches its inactive state)
remain pulled up to V
CMDVCCN
buffer is able to continuously deliver up to 65mA at Vcc = 5 V, 65 mA at Vcc = 3 V,
CC
CC
Oscint
falls to zero (t
< 0.4 V (t
Xtal1
VCC
VUP
RST
CLK
Deactivation sequence
I/O
All information provided in this document is subject to legal disclaimers.
de
t10
= t
11
t11
14
15
Rev. 1.0 — 19 April 2011
11
= t
= t
= t
DD(INTF)
+ 3T/2 + Vcc fall time)
t12
10
12
11
11
+ 3T/64)
= t
+ 3T/2) (The deactivation sequence is completed when V
+ 7T/2)
t13
high frequency
11
via a 10 kΩ resistor).
+T/2)
t14
13
= t
11
+ T)
Figure
9):
t15
TDA8035HN
low frequency
Smart card interface
© NXP B.V. 2011. All rights reserved.
001aan753
T / 2
14 of 32
CC