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TDA8023TT

Low power IC card interface

NXP Semiconductors. 

NXP Semiconductors

TDA8023

Low power IC card interface

Table 10. R1_01 - Register 1 subaddress 01 in Read/Write mode bit description

Bit

Symbol

Description

7 to 0 D[7:0]

8-bit programmable CLK period count register;

range: 0 to 255;

initial value: 170

Table 11. R1_10 - Register 1 subaddress 10 in Read/Write mode bit description

Bit

Symbol

Description

7 to 0 C[15:8]

8-bit programmable CLK period count register;

range in combination with C[7:0]: 0 to 65535;

initial value: 164

Table 12. R1_11 - Register 1 subaddress 11 in Read/Write mode bit description

Bit

Symbol

Description

7 to 0 C[7:0]

8-bit programmable CLK period count register;

range in combination with C[15:8]: 0 to 65535;

initial value: 116

If bit RSTIN = 0 when bit START is set to logic 1, then pin RST is controlled by bit RSTIN.

Else, pin RST = LOW during a number of CLK periods, defined by the 16-bit CLK count

register C[15:0], and goes HIGH afterwards.

There are two synchronous card management types:

• If bit PDWN = 0 when bit START is set to logic 1, then the output CLK is controlled by

input CLKIN (without division)

• If bit PDWN = 1 when bit START is set to logic 1, then the output CLK is controlled by

bit CLKPD1

8.4 DC-to-DC converter

For generating a supply voltage VCC of 5 V  5 % or 3 V  5 % to the card, an integrated

voltage converter is incorporated. This DC-to-DC converter should be separately supplied

by VDD(DCDC) on pin VDDP and GNDP (from 2.7 V to 6.5 V).

The DC-to-DC conversion is either capacitive or inductive, according to the external

components (automatic detection).

8.4.1 Capacitive configuration

The external components are three 100 nF capacitors (low-ESR), see Figure 1.

The DC-to-DC converter is either tripler, doubler or follower according to the respective

values of VCC and VDD(DCDC). An hysteresis of 100 mV is present on both thresholds:

• Follower:

– If VCC = 5 V and VDD(DCDC) > 5.8 V

– If VCC = 3 V and VDD(DCDC) > 4 V

– If VCC = 1.8 V

TDA8023

Product data sheet

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

Rev. 2.0 — 24 June 2016

© NXP Semiconductors N.V. 2016. All rights reserved.

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