SL900A datasheet(42/103 Pages) AMSCO

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[v1-12] 2018-Oct-29

SL900A − Custom Command Description

Get Battery Level

The GET BATTERY LEVEL command starts the AD conversion on

the battery voltage and returns the voltage level with the

battery type (1.5V or 3V).

Command Structure:

Successful Reply Structure:

The application can also request the battery type re-check if

the battery retrigger field has the value “00000001”, otherwise

the battery retrigger field needs to have the value “00000000”.

After connecting a new battery it is strongly recommended to

execute an Inventory round and send a Get Battery Level

command with retrigger option enabled. This is to ensure the

correct battery type 3V or 1.5V is selected based on the battery

voltage after it has settled. The retrigger option should not be

used when the battery has been partly or fully consumed

otherwise the battery type (3V or 1.5V) may be set to the wrong

type.

SOF

Custom

Command Code

Battery Retrigger

Handle

CRC

Frame - sync

0xE0

0xAA

8 bits

16 bits

SOF

Header

A/D

Error

Battery

Type

Zeros

Battery

Level

Handle

CRC

EOF

Pilot tone

preamble

1 bit [0]

1 bit -

error [1]

1 bit - [0 =

1.5V, 1 = 3V]

4 bits

[0000]

10 bits

16 bits

Dummy

bit [1]

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