DVK90129 Melexis Inc, DVK90129 Datasheet - Page 38

• Manufacturer Part Number: DVK90129
• Description: DEVELOPMENT KIT MLX90129
• Manufacturer: Melexis Inc
• Series: -r
• Type: Development kitr

Specifications of DVK90129

• Contents: Board, Proxima RF™ Desktop Reader
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• For Use With/related Products: MLX90129

9.1.6 Master SPI configuration
A bit of the Device security map is used to set the SPI as master. Then, the MLX90129 controls the clock
SCK, the slave-select SS (output), and the communication I/O MOSI (output) and MOSI (input).
The SPI configuration words are used to setup the parameters of the SPI-master interface, in order to access
an external memory (a serial SPI EEPROM). In master mode, the SPI may be used by the internal DMA unit
(Direct Memory Access) to store the output data of the sensor. The stored data may be read back by a RFID
base-station.
Master SPI configuration words (EEPROM & Register, #0D and #0E, read/write)
(*) Note:
The setting of the bit Burst mode enable switches all subsequent transactions with an external memory into
burst mode. It means, that only the first memory access transaction requires sending a command and an
address. After completion of this first transaction, the master SPI of the MLX90129 does not set the SS signal
to ‘1’. When a new block has to be read / written, the SPI master skips the command and address phases
and immediately sends or receives data to or from the external memory (it allows a page access).
3901090129
Rev 007
Bits
#0D – External memory control word
15:8
7
6:4
3:2
1:0
#0E – External memory command codes word
15:8
7:0
Name
SPI_WriteEn_Code
SPI_BurstMode_En
SPI_WriteDelay
SPI_WriteEn_Ctrl
SPI_AddressMode
SPI_WriteCode
SPI_ReadCode
Description
Write enabled command code. Command op-code of the “write enable”
operation, used toward an external EEPROM.
Burst mode enable: enable the write burst mode used in some SPI serial
EEPROM. (*)
Write delay. Delay which is inserted between a write command and another
subsequent command. Precision is 4 ms. Minimal write delay calculation
equation, when value of this field is non-zero: t
Write enable operation control. Defines when the Write Enable command
must be applied:
Addressing mode. Defines the address length to be passed via SPI for a
proper EEPROM addressing.
Write command code. Command op-code used by MLX90129 to write in an
external memory block
Read command code. Command op-code used by MLX90129 to read from
an external memory block
00 - never
01 - reserved
10 - before every write operation
11 - reserved
00 - 8-bit address is used
01 - 16-bit address is used
10 - 24-bit address is used (8 MSB are filled with 00)
11 - reserved
13.56MHZ SENSOR TAG / DATALOGGER IC
Page 38 of 56
WC
= 4 x WriteDelay - 1 (ms).
MLX90129
Data Sheet
March 2011