TMC222-SI TRINAMIC, TMC222-SI Datasheet - Page 27

• Manufacturer Part Number: TMC222-SI
• Description: IC, MOTOR CTRL/DRVR, STEPPER, SOIC-20
• Manufacturer: TRINAMIC

Specifications of TMC222-SI

• Motor Type: Stepper
• No. Of Outputs: 4
• Output Current: 800mA
• Supply Voltage Range: 8V To 29V
• Driver Case Style: SOIC
• No. Of Pins: 20
• Operating Temperature Range: -40°C To +125°C
• Device Type: Motor
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

TMC222 DATASHEET (V. 1.06 / March 15, 2007)
6.5 Read data from TMC222
When reading data from a slave two datagrams are needed. The first datagram consists of two bytes
of data. The first byte consists of the slave address and the write bit. The second byte consists of the
address of an internal register of the TMC222. The internal register address is stored in the circuits
RAM. The second datagram consists of the slave address and the read bit. Then the master can read
the data bits on the SDA line with every rising edge of the SCL line. After each byte of data the
master has to acknowledge correct data reception by pulling SDA low. The last byte must not be
acknowledged by the master so that the slave knows the end of transmission (see figure below).
Copyright © 2004-2007 TRINAMIC Motion Control GmbH & Co. KG
S
Dump Internal Address to Slave
Read Data from Slave
Figure 20: Two Wire Serial Interface - Read Data from Slave
Figure 19: Two Wire Serial Interface - Writing Data to Slave
master to slave
slave to master
S
S
Slave addr
master to slave
slave to master
Slave addr
Slave addr
'0' (Write)
'0' (Write)
'1' (Read)
R/W
S: Start Condition
P: Stop Condition
A: Acknowledge (SDA low)
A: not Acknowledge (SDA high)
R/W
R/W
S: Start Condition
P: Stop Condition
A: Acknowledge (SDA low)
A: not Acknowledge (SDA high)
A
A
A
internal addr
DATA
DATA
(n Bytes + acknowledge)
(n Bytes + acknowledge)
A
A
A
P
DATA
DATA
A
A
P
P
27