SRTAG2K-D View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
SRTAG2K-D Datasheet PDF : 51 Pages
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Signal descriptions
2
Signal descriptions
SRTAG2K-D
2.1
Antenna coil (AC0, AC1)
These inputs are used to connect the 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 access the device using NFC Forum Type 4
commands.
2.2
Ground (VSS)
VSS, when connected, is the reference for the VCC supply voltage for all pads, even AC0
and AC1.
2.3
2.3.1
RF Session output
The RF Session Output pin is an open drain output and must be connected to an external
pull-up resistor > 4.7 KOhm ( 20 KOhm is recommended to save power consumption)
Session Open configuration (RF Session field = 0x11)
"Session Open" pad goes to the Low state when an RF session is ongoing (see Figure 3).
An RF session is taken when SRTAG2K-D receives a valid Select Application. The session
is released after SRTAG2K-D has received a valid Deselect command, when the RF field
became OFF.
RF Session pad is driven low after a delay (1) when the session is open.
RF Session pad is released after a delay (2) when the session is released.
Figure 3. Session Open (RF Session field = 0x11)
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1. CmdEOFtoGPlow (RF command End of frame to RF Session pad low)
2. CmdEOFtoGPHZ (RF command End of frame to RF Session pad HZ)
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DocID025446 Rev 3
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