ST25DV04KC datasheet(8/203 Pages) STMICROELECTRONICS

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2.3

RF link (AC0 AC1)

2.3.1

Antenna coil (AC0, AC1)

These inputs are used to connect the ST25DVxxKC device to an external coil exclusively. It is advised not to

connect any other DC or AC path to AC0 or AC1.

When correctly tuned, the coil is used to power and access the device using the ISO/IEC 15693 and ISO 18000-3

mode 1 protocols.

2.4

Process control (GPO, VDCG)

2.4.1

Driver supply voltage (VDCG)

This pin, available only with 10-ball and 12-pin ST25DVxxKC packages, can be connected to an external DC

supply voltage. It only supplies the GPO (CMOS) driver block.

ST25DVxxKC cannot be powered by VDCG. If VDCG is left floating, there is not any information available on the

GPO (CMOS) pin.

2.4.2

General purpose output (GPO)

The ST25DVxxKC features a configurable output GPO pin used to provide RF and I²C activity information to an

external device.

Depending on the ST25DVxxKC package version, there are two types of GPO output:

•

8-pin ST25DVxxKC packages offer an open drain GPO output. This GPO pin must be connected to an

external pull

‑up resistor (> 4.7 kΩ) to operate.

•

10-ball and 12-pin ST25DVxxKC packages offer a CMOS GPO output, which requires to connect VDCG pin

to an external power supply. The interrupt consists of setting the state to a high level, or outputting a positive

pulse on the GPO pin.

GPO pin is a configurable output signal, and can mix several interruption modes. By default, the GPO register

sets the interruption mode as an RF field change detector. It is able to raise various events like RF activity,

Memory write completion, or fast transfer actions. It can authorize the RF side to directly drive the GPO pin

using the Manage GPO command, to set the output state, or emit a single pulse (for example, to wake up an

application.). See Section 5.4 GPO for details.

2.5

Energy harvesting analog output (V_EH)

This analog output pin is used to deliver the analog voltage V_EH available when the Energy harvesting mode

is enabled and if the RF field strength is sufficient. When the Energy harvesting mode is disabled or the RF field

strength is not sufficient, V_EH pin is in High-Z state (See Section 5.5 Energy harvesting (EH) for details).

Energy harvesting voltage output is not regulated.

ST25DV04KC ST25DV16KC ST25DV64KC

RF link (AC0 AC1)

DS13519 - Rev 3

page 8/203

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