TDA8034HN-C1,151 datasheet(11/30 Pages) NXP

部件名	TDA8034HN-C1,151

功能描述	The TDA8034HN is a cost-effective analog interface for asynchronous and synchronous

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制造商	NXP [NXP Semiconductors]

网页	http://www.nxp.com

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11 / 30 page

TDA8034HN

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 3.1. — 5 September 2011

11 of 30

NXP Semiconductors

TDA8034HN

Smart card interface

Remark: The value of period T is 64 times the period interval of the internal oscillator (i.e.

 25 s).

8.9 VCC regulator

The VCC buffer is able to continuously deliver up to 65 mA at VCC = 5V, 3V, or 1.8V.

The VCC buffer has an internal overload protection with a threshold value of approximately

120 mA. This detection is internally filtered, enabling spurious current pulses up to

200 mA with a duration of a few milliseconds to be drawn by the card without causing

deactivation. However, the average current value must stay below maximum; see Table 8.

8.10 Fault detection

The following conditions are monitored by the fault detection circuit:

• Short-circuit or high current on pin VCC

• Card removal during transaction

• VDDP falling

• VDD falling

• VDD(INTF) falling

• Overheating

Fault detection monitors two different situations:

• Outside card sessions, pin CMDVCCN is HIGH: pin OFFN is LOW if the card is not in

the reader and HIGH if the card is in the reader. Any voltage drop on VDD is detected

by the voltage supervisor. This generates an internal power-on reset pulse but does

not act upon the pin OFFN signal. The card is not powered-up and short-circuits or

overheating are not detected.

OSCINT = internal oscillator.

Fig 8.

Deactivation sequence

001aak995

RST

CLK

I/O

VCC

XTAL1

OSCINT

CMDVCC

high frequency

t10 t11

t12

t13

tdeact

t14

low frequency

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