TDA8035HN/C1,157 NXP Semiconductors, TDA8035HN/C1,157 Datasheet - Page 15

• Manufacturer Part Number: TDA8035HN/C1,157
• Description: Interface - Specialized SMART CARD INTERFACE
• Manufacturer: NXP Semiconductors

Specifications of TDA8035HN/C1,157

• Rohs: yes
• Factory Pack Quantity: 2450

NXP Semiconductors
TDA8035HN
Product data sheet
COMPANY PUBLIC
8.10 Fault detection
The circuit monitors the following fault conditions:
There are two different cases (see
A bounce can occur on the PRESN signal during card insertion or withdrawal. The bounce
depends on the type of card presence switch within the connector (normally closed or
normally open), and on the mechanical characteristics of the switch. To prevent this
bounce, a debounce function of approximately 4.05 ms (t
integrated in the device.
When the card is inserted, OFFN goes High only at the end of the debounce time (see
Figure 11 on page
When the card is extracted, an automatic deactivation sequence of the card is performed
on the first true/false transition on PRESN. OFFN goes Low.
1. CMDVCCN High (outside a card session): OFFN is Low when the card is not in the
2. CMDVCCN Low (within a card session): OFFN falls Low in any of the previously
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•
•
•
does not act upon OFFN. The card is not powered-up, so no short-circuit or
overheating is detected.
short-circuit or high current on V
Card removal during transaction
V
overheating.
reader, and High when the card is in the reader. The supply supervisor detects a
supply voltage drop on V
mentioned cases. As soon as the fault is detected, an emergency deactivation is
automatically performed. When the system controller sets CMDVCCN back to High, it
senses OFFN again. After a complete deactivation sequence, the system controller
sets CMDVCCN back to High and it senses OFFN again. This is to distinguish
between a hardware problem or a card extraction. OFFN reverts to High when the
card is still present.
DDP
or V
DD(INTF)
All information provided in this document is subject to legal disclaimers.
16).
Rev. 2.1 — 3 December 2012
or V
reg
DDP
dropping
and generates an internal power-on reset pulse, but it
Figure 10 on page
CC
16):
deb
= 1280  1/(f
TDA8035HN
Smart card interface
© NXP B.V. 2012. All rights reserved.
osc(int)_Low
) is
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