TDA8034T Philips Semiconductors, TDA8034T Datasheet - Page 5

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

NXP Semiconductors
[5]
8. Functional description
TDA8034T_TDA8034AT_1
Product data sheet
Uses an internal 20 k pull-up resistor connected to pin V
8.1 Power supplies
8.2 Voltage supervisor
Remark: Throughout this document the ISO 7816 terminology conventions have been
adhered to and it is assumed that the reader is familiar with these.
The power supply voltage ranges are as follows:
All interface signals to the system controller are referenced to V
remain inactive during power up or power down. After powering up the device, pin OFFN
remains LOW until pin CMDVCCN is set HIGH and pin PRESN is LOW. During power
down, pin OFFN goes LOW when V
The internal oscillator frequency (f
When the card is not activated (pin CMDVCCN is HIGH), the internal oscillator is in low
frequency mode to reduce power consumption.
This device has a Low Drop-Off (LDO) voltage regulator connected to pin V
used instead of a DC-to-DC converter. It ensures a minimum V
power supply voltage on pin V
of 65 mA.
Fig 3.
•
•
V
V
DDP
DD
: 2.7 V to 3.6 V
: 4.85 V to 5.5 V
Voltage supervisor circuit
V
5 V or 3 V
DD(INTF)
Rev. 01 — 5 February 2010
V
V
DDP
DD
DD
.
DDP
osc(int)
does not fall below 4.85 V for a maximum load current
DDP
) is only used during the activation sequences.
TDA8034T; TDA8034AT
falls below the falling threshold voltage (V
REFERENCE
VOLTAGE
V
DD
001aak991
CC
DD(INTF)
of 4.75 V and that the
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Smart card interface
. All card contacts
© NXP B.V. 2010. All rights reserved.
CC
, and is
th
).
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