ST25DV04K datasheet(21/220 Pages) STMICROELECTRONICS

21 / 220 page

DocID027603 Rev 4

21/220

ST25DV04K ST25DV16K ST25DV64K

Signal descriptions

219

2.3

RF link (AC0 AC1)

2.3.1

Antenna coil (AC0, AC1)

These inputs are used to connect the ST25DVxxx 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 (VDCG, GPO)

2.4.1

Driver Supply voltage (VDCG)

This pin, available only with ST25DVxx-JF version, can be connected to an external DC

supply voltage. It only supplies the GPO driver block. ST25DVxxx cannot be powered by

VDCG. If VDCG is left floating, no information will be available on GPO pin.

2.4.2

General purpose output (GPO)

The ST25DVxxx features a configurable output GPO pin used to provide RF activity

information to an external device. ST25DVxx-IE offers a GPO open drain. This GPO pin

must be connected to an external pull-up resistor (> 4.7 K

Ω) to operate.

The interrupt consists in pulling the state to a low level or outputting a low-level pulse on

GPO pin.

ST25DVxx-JF offers a GPO CMOS output, which requires to connect VDCG pin to an

external power supply. The interrupt consists in 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 a 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 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 5.2: 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 5.3: Energy Harvesting (EH) for details).

Energy harvesting voltage output is not regulated.

ST25DV04K 数据表(PDF) 21 Page - STMicroelectronics

ST25DV04K 数据表(HTML) 21 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

数据表下载