L3G4200DHTR STMicroelectronics, L3G4200DHTR Datasheet - Page 21

• Manufacturer Part Number: L3G4200DHTR
• Description: Gyroscopes Digital Gyro 96 FIFO 250 / 500 / 2000 DPS
• Manufacturer: STMicroelectronics

Specifications of L3G4200DHTR

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

L3G4200DH
Table 16.
4.2
Master ST SAD+W
Slave
Table 14.
Table 15.
Transfer when master is receiving (reading) multiple bytes of data from slave
Data are transmitted in byte format (DATA). Each data transfer contains 8 bits. The number
of bytes transferred per transfer is unlimited. Data is transferred with the most significant bit
(MSb) first. If a receiver cannot receive another complete byte of data until it has performed
some other function, it can hold the clock line SCL LOW to force the transmitter into a wait
state. Data transfer only continues when the receiver is ready for another byte and releases
the data line. If a slave receiver does not acknowledge the slave address (i.e., it is not able
to receive because it is performing some real-time function) the data line must be left HIGH
by the slave. The master can then abort the transfer. A LOW to HIGH transition on the SDA
line while the SCL line is HIGH is defined as a STOP condition. Each data transfer must be
terminated by the generation of a STOP (SP) condition.
In order to read multiple bytes, it is necessary to assert the most significant bit of the sub-
address field. In other words, SUB(7) must be equal to 1, while SUB(6-0) represents the
address of the first register to be read.
In the presented communication format, MAK is “master acknowledge” and NMAK is “no
master acknowledge”.
SPI bus interface
The SPI is a bus slave. The SPI allows writing and reading of the registers of the device. The
serial interface interacts with the external world through 4 wires: CS, SPC, SDI and SDO.
Master
Master
Slave
Slave
SAK
ST
ST
Transfer when master is writing multiple bytes to slave
Transfer when master is receiving (reading) one byte of data from slave
SUB
SAD + W
SAD + W
SAK
SAK
SR SAD+R
SAK
Doc ID 17300 Rev 1
SUB
SUB
SAK
SAK DATA
SAK
SR
SAD + R
DATA
MAK
DATA
SAK
SAK
MAK
DATA
DATA
DATA
Digital interfaces
NMAK
NMAK
SAK
SP
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SP
SP