TMC222-SI TRINAMIC, TMC222-SI Datasheet - Page 25

• 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 Two-Wire Serial Interface
6.1 Physical Layer
Both SDA and SCL lines are connected to positive supply voltage via a current source or pull-up
resistor (see figure below). When there is no traffic on the bus both lines are high. Analog glitch filters
are implemented to suppress spikes with a length of up to 50 ns.
6.2 Communication on Two Wire Serial Bus Interface
Each datagram starts with a Start condition and ends with a Stop condition. Both conditions are
unique and cannot be confused with data. A high to low transition on the SDA line while SCL is high
indicates a Start condition. A low to high transition on the SDA line while SCL is high defines a Stop
condition (see figure below).
The SCL clock is always generated by the master. On every rising transition of the SCL line the data
on SDA is valid. Data on SDA line is only allowed to change as long as SCL is low (see figure below).
Copyright © 2004-2007 TRINAMIC Motion Control GmbH & Co. KG
SDA line
SCL line
SCL_IN
SCL_OUT
TMC222
Figure 15: Two Wire Serial Interface - Start / Stop Conditions
Figure 14: Two Wire Serial Interface - Physical Layer
Figure 16: Two Wire Serial Interface - Bit transfer
SDA_OUT
SDA
SCL
SDA_IN
SDA
SCL
condition
START
data valid
data line
stable,
SCL_IN
SCL_OUT
Master
data change
allowed
SDA_OUT
SDA_IN
condition
STOP
+ 5V
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