TDA8034HN All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2016. All rights reserved.
Product data sheet Rev. 3.4 — 29 June 2016 6 of 32
NXP Semiconductors
TDA8034HN
Low power smart card interface
[1] I = input, O = output, I/O = input/output, G = ground and P = power supply.
[2] If pin PRESN is LOW, the card is considered to be present. During card insertion, debouncing can occur on these signals. To counter
this, the TDA8034HN has a built-in debouncing timer (typically 8 ms).
[3] Uses an internal 11 k pull-up resistor connected to pin V
CC
.
[4] Uses an internal 20 k pull-up resistor connected to pin V
DD(INTF)
.
[5] Uses an internal 10kW pull-up resistor connected to pin V
DD(INTF)
8. Functional description
Remark: Throughout this document the ISO 7816 terminology conventions have been
adhered to and it is assumed that the reader is familiar with these.
8.1 Power supplies
The power supply voltage ranges are as follows:
• V
DDP
: 4.85 V to 5.5 V when VCC_SEL2 is HIGH (V
CC
= 5 V)
• V
DDP
: 3 V to 5.5 V when VCC_SEL2 is LOW (V
CC
= 3 V) or when VCC_SEL1 is LOW
(V
CC
= 1.8 V)
• V
DD
: 2.7 V to 3.6 V
All interface signals to the system controller are referenced to V
DD(INTF)
. All card contacts
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
DDP
falls below the falling threshold voltage (V
th
).
The internal oscillator frequency (f
osc(int)
) is only used during the activation sequences.
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
CC
, and is
used instead of a DC-to-DC converter. It ensures a minimum V
CC
of 4.75 V and that the
power supply voltage on pin V
DDP
does not fall below 4.85 V when pin VCC_SEL2 is
HIGH, for a maximum load current of 65 mA.
V
DDP
16 V
DDP
P low-dropout regulator input supply voltage
V
DD
17 V
DD
P digital supply voltage
PORADJ 18 V
DD(INTF)
I power-on reset threshold adjustment input using an optional external resistor bridge
OFFN 19 V
DD(INTF)
O NMOS interrupt to microcontroller
[4]
; active LOW; see Section 8.10 on page 12
I/OUC 20 V
DD(INTF)
I/O microcontroller input/output data line
[5]
AUX1UC 21 V
DD(INTF)
I/O auxiliary microcontroller input/output data line
[5]
AUX2UC 22 V
DD(INTF)
I/O auxiliary microcontroller input/output data line
[5]
XTAL1 23 V
DD
I crystal connection input
XTAL2 24 V
DD
O crystal connection output
Table 3. Pin description
…continued
Symbol Pin Supply Type
[1]
Description
