TDA8023 datasheet(8/32 Pages) NXP

8 / 32 page

TDA8023_1

Product data sheet

Rev. 01 — 16 July 2007

8 of 32

NXP Semiconductors

TDA8023

Low power IC card interface

8.2.4 Shutdown mode

When pin SDWN = HIGH, the TDA8023 is in Shutdown mode; the consumption in this

mode is less than 10

µA. The I2C-bus is unresponsive.

If the card is extracted or inserted when the TDA8023 is in Power-down mode, pin INT

becomes LOW and stays LOW as long as pin SDWN = HIGH.

When pin SDWN is pulled LOW, the TDA8023 leaves Shutdown mode and executes a

complete power-on reset sequence.

8.3 I2C-bus

A 400 kHz I2C-bus slave interface is used for conﬁguring the TDA8023 and reading the

status.

8.3.1 I2C-bus protocol

The I2C-bus is for 2-way 2-line communication between ICs or modules. The serial bus

consists of two bidirectional lines: one for data signals (SDA) and one for clock signals

(SCL).

Both the SDA and SCL lines must be connected to a positive supply voltage via a pull-up

resistor.

The following protocol has been deﬁned:

• Data transfer may be initiated only when the bus is not busy

• During data transfer, the data line must remain stable whenever the clock line is

HIGH; changes in the data line while the clock line is HIGH will be interpreted as

control signals

8.3.2 Bus conditions

The following bus conditions have been deﬁned.

Bus not busy — Both data and clock lines remain HIGH.

Start data transfer — A change in the state of the data line from HIGH to LOW, while the

clock is HIGH, deﬁnes the START condition.

Stop data transfer — A change in the state of the data line from LOW to HIGH, while the

clock is HIGH, deﬁnes the STOP condition.

Data valid — The state of the data line represents valid data when, after a START

condition, the data line is stable for the duration of the HIGH period of the clock signal.

There is one clock pulse per bit of data.

8.3.3 Data transfer

Each data transfer is initiated with a START condition and terminated with a STOP

condition (see Figure 7). See Table 15 for timing information.

Data transfer is unlimited in the Read mode. The information is transmitted in bytes and

each receiver acknowledges with a 9th bit.

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