ST25TA02K datasheet(47/50 Pages) STMICROELECTRONICS

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ST25TA02K

RF electrical parameters

This section summarizes the operating and measurement conditions, and the DC and AC

characteristics of the device in RF mode.

The parameters in the DC and AC characteristics tables that follow are derived from tests

performed under the Measurement Conditions summarized in the relevant tables.

Designers should check that the operating conditions in their circuit match the measurement

conditions when relying on the quoted parameters.

Table 56. Default operating conditions

Symbol

Parameter

Min.

Max.

Unit

Ambient operating temperature

–40

°C

Table 57. RF characteristics(1)

Symbol

Parameter

Condition

Min

Typ

Max

Unit

External RF signal frequency

13.553

13.56

13.567

MHz

H_ISO

Operating field according to ISO

TA = 0°C to 50°C

1500

7500

mA/m

H_Extended

Operating field in extended

temperature range

TA = -40°C to 85°C

100

7500

mA/m

Hmin

Field detect, Set-up field(1)

TA = -40°C to 85°C

mA/m

MICARRIER 100% carrier modulation index

MI=(A-B)/(A+B)

100

Pause A length

28 / fC

40.5 / fC

µs

Pause A low time

7 / fC

-t1

µs

Pause A rise time

1.5xt4

16 / fC

µs

Pause A rise time section

6 / fC

µs

tMIN CD

Minimum time from carrier

generation to first data

From H-field min

RF write time (including internal

Verify) for one page

4.468(2)

-ms

CTUN / 5 (3) Internal tuning capacitor(4)

fC = 13.56 MHz

tRF_OFF

RF OFF time

Chip reset

0.1

1. All timing characterizations were performed on a reference antenna with the following characteristics:

External size: 75 mm x 48 mm

Number of turns: 4

Width of conductor: 0.5 mm

Space between two conductors: 0.5 mm

Value of the tuning capacitor: 50 pF (ST25TA02K)

Value of the coil: 2.5 µH

Tuning frequency: 14.2 MHz.

2. Time between command EOF and Response SOF when Updating NDEF message Length

3. See Capacitor value

4. Characterized only, at room temperature only, measured at VAC0-VAC1 = 2 V peak to peak at 13.56 MHz.

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