SL900A datasheet(12/103 Pages) AMSCO

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[v1-12] 2018-Oct-29

SL900A − Shor t Description

The SL900A is designed for use in smart active labels (SAL),

semi-passive labels and passive labels. Smart active labels are

defined as thin and flexible labels that contain an integrated

circuit and a power source. SAL includes in its definition both

“fully active” smart labels, and semi-active smart labels, also

known as battery-assisted back-scattered passive labels, both

of which enable enhanced functionality and performance over

passive labels. The IC includes sensor functionality and logging

of sensor data (see Figure 13 below).

The SL900A is operating at 860 to 960 MHz and is fully EPCglobal

Class 1 compliant. The chip is supplied from a single-cell battery

of typically 1.5V, or from a dual cell battery (3V).

3V batteries are recommended because of the wider operating

voltage range. The on-chip temperature sensor and real-time

clock (RTC) accommodate temperature data logging.

Supply Arrangement

The SL900A is supplied from either the battery or through the

electromagnetic waves from a reader. The device is normally

supplied from the battery unless there is no battery attached

(passive label), or when the battery is drained. In Battery

Assisted Passive Mode the chip can be supplied by either a 3V

or a 1.5V battery. A 3V battery is recommended as there is a

wider operating voltage range with 3V. At power up a battery

check is carried out to determine if a 3V or 1.5V battery is

connected. It is strongly recommended after first connection of

a battery that an inventory round is performed and the custom

command Get Battery Level with battery retrigger is executed.

This will repeat the battery check when the battery voltage is

stable and ensure the correct battery type 3V or 1.5V type

selection is selected.

Figure 13:

Block Diagram

Short Description

Oscillator

with RTC

10-Bit A/D

Converter

Processing

Digital Control

EPC Gen2

Class 3

(cool-Log™)

FIFO

1152 x 8 Bit

EEPROM

Temperature

Sensor

860 - 960 MHz

AFE

SPI

Port

(Slave)

Power

Management

BAT

ANT

SCLK

SEN

1.5V

or 3V

EXT1

MUX

MEAS

OUT

SL900A

EXT2

REF

ANA TEST

EXC

DIGI TEST

External

Sensor

Front-End

POS

SSA

Battery Voltage

SL900A Datasheet(PDF) 12 Page - ams AG

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