SL900A datasheet(13/103 Pages) AMSCO

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ams Datasheet

Page 13

[v1-12] 2018-Oct-29

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SL900A − Short Description

Analog Front End (AFE)

The analog front end is designed according to EPC Gen 2. The

forward link (reader to tag) is amplitude modulated and the

backward link (tag to reader) is amplitude modulated (load

modulation is used). Please note for QFN the ANT pin is

connected to one side of the dipole antenna and VSSA+VSS are

connected to the other side as shown in Figure 13. For bare die

ANT1 should be left unconnected, ANT2 should be connected

to one side of the dipole and VSSA+VSS connected to the other.

Processing and Digital Control

The SL900A is fully EPC Class 1 compliant, with additional

custom commands for extended functions. The maximum

transponder to interrogator data rate according to Class

1/Gen.2 is 640 kbit/s. The maximum interrogator to

transponder data rate is 160 kbit/s.

Figure 14:

Supported Data Rates

Serial Interface (SPI Slave)

The integrated serial interface (SPI) can be used to initialize the

chip and to set the parameters. The logging procedure can be

started and stopped with the SPI. The SPI bus can also be used

for the communication between a microcontroller that is

attached to the SL900A and the RFID reader.

Real-Time Clock (RTC)

The on-chip real-time clock (RTC) is started through the START

LOG command in which the start time is programmed in UTC

format. The interval for sensing and data logging can be

programmed in the range from 1 second up to 9 hours. The

accuracy of the timer is tRTC-A. The timer oscillator is calibrated

at 6ºC with accuracy tRTC-CA.

Data Rate

Min

Max

Interrogator to transponder

40 kbit/s

160 kbit/s

Transponder to interrogator

5 kbit/s

640 kbit/s

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