mlx90313 ETC-unknow, mlx90313 Datasheet - Page 29

• Manufacturer Part Number: mlx90313
• Description: Programmable Ir Sensor Interface
• Manufacturer: ETC-unknow

command is always 32 bits: 8 bits for the operation code, 8 bits for the address and 16 bits of data. The
communication protocol is presented below.
write command
read command
Every write command starts with a high to low transition of CS and ends by a low to high transition of CS
after 32 periods of the serial data clock (SCLK). MLX90313 reads the data present on SDI on the rising
edge of the clock. With a delay of 8 periods of the serial clock, the SPI will repeat the opcode, address
and the first 8 bits of data on pin SDO. This allows the external master to check command and address
and terminate the operation in case of an error by forcing CS high before the end of the complete
command cycle, i.e. before the end of the 32 clock periods.
The read command is build up similarly, except that no data has to be passed of course. On SDO the
opcode will be followed directly by the requested data, the address is not returned in this case.
The data on SDO is valid on the rising edge of the clock. In case of a read command, the SPI output will
be valid on SDO starting on the 17
above.
Timing/speed
The bit-rate depends on the serial data clock (SCLK) supplied by the master controller and is limited to
125kb/s. The timing requirements are given in the figure and table below
SPI timing requirements
Symbol
tsclk
tcls
tsch
tsu
thd
MLX90313 Programmable IR sensor Interface
3901090313
SCLK
SCLK
SDO
SDO
SDI
SDI
CS
CS
C7
C7
SCLK
SDO
C6
C6
SDI
CS
C5
C5
C4
C4
C3
C3
C2
C2
C1
C1
Parameter
Sclk period
CS low to SCLK high
SCLK low to CS high
data in setup time
data in hold time
X
X
tcls
tsu
C0
C0
A7
C7
A7
C7
A6
C6
A6
C6
th
C5
A5
C5
A5
rising edge of the clock (after CS low) as indicated in the figure
A4
C4
A4
C4
A3
C3
A3
C3
A2
C2
A2
C2
thd
tsclk
C1
A1
C1
A1
A0
C0
A0
C0
Page 29
D15
D15
Value
min 8
min 50
min 50
min 200
min 200
A7
X
D14
D14
A6
Programmable IR Sensor Interface
D13
D13
A5
D12
D12
A4
D11
D11
A3
D10
D10
A2
D9
A1
D9
tdv
D8
A0
D8
D15
D7
D7
D14
D6
D6
Unit
ns
ns
ns
ns
D13
D5
D5
s
tsch
D12
D4
D4
MLX90313
D11
D3
D3
D10
Rev 1.0 21-July-2001
D2
D2
D1
D1
D9
D0
D8
D0
X
X
X