SL900A datasheet(45/90 Pages) AMSCO

45 / 90 page

ams Datasheet: 2014-May-06 [v1-01]

SL900A – 45

SP I I n te r f a c e

Full and unlimited EEPROM access is possible through the SPI

interface. The primary function of the SPI interface is

production calibration and UID programming, but it can also

be used in application, for the data transmission between the

interrogator and a microcontroller attached to the SPI interface.

The chip has a basic arbitration implemented that controls the

EEPROM access from the RFID interface, the automatic data

logger and the SPI interface. The RFID interface has the highest

priority, second is the automatic data logger, and last is the SPI

interface.

The first 2 bits in the frame are the MODE bits, which define the

SPI operation (00 – Write memory, 01 – Read memory, 10 – Test,

11 – Direct command). The EEPROM address is an 11-bit address

that point to the physical locations in the EEPROM. The write

command can be executed on a single byte, or any number of

successive bytes on a single page (up to 16 bytes). The minimum

number of bytes in the Page write operation is 2. The Read

operation is a continuous operation, so any number of bytes

can be read with a single frame. The address is the starting

address and is automatically incremented in the chip.

The Test MODE is reserved for production testing and cannot

be used in application.

The maximum SCLK frequency is 10MHz at 3V battery supply

(dual cell). With a 1.5V battery supply the maximum frequency

is 2MHz.

Figure 30:

SPI Communication Modes

MODE

EEPROM Address / Command Code

Data

Byte

A15

A14

A13

A12

A11

A10...A0

D7...D0

Write Mode

000

Physical EEPROM address

DI7 … DI0

Page Write

Mode

Physical EEPROM address

DI7 … DI0

...16 data bytes

Read Mode

Physical EEPROM address

DO7...DO0

...Continuous

read (n*8 bits)

Test Mode

RESERVED for PRODUCTION

Command

Mode

C5...C0

SPI Interface

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