TMC2225 DATASHEET (Rev. 1.15 / 2023-FEB-16)
11
3.2 Internal RDSon Sensing
For cost critical or space limited applications, sense resistors can be omitted. For internal current
sensing, a reference current set by a tiny external resistor programs the output current. For calculation
of the reference resistor, refer chapter 9.1.
Attention
Be sure to switch the IC to RDSon mode, before enabling drivers: Set otp_internalRsense = 1.
Place near IC with
short path to die pad
2.2µ
6.3V
RREF
Step and Direction
motion control
TMC2225
STEP
DIR
Step&Dir input
Configuration
(GND/open or VCC_IO)
optional UART interface
MS1
MS2
SPREAD
(only TMC222x)
PDN/UART
Driver error
Index pulse
opt. ext. clock
10-16MHz
3.3V or 5V
I/O voltage
DIAG
INDEX
(not with TMC2202)
CLK_IN
VCC_IO
100n
Step Pulse
Generator
Configuration
Memory (OTP)
Configuration
Interface
B. Dwersteg, ©
TRINAMIC 2016
UART interface
+ Register Block
Programmable
Diagnostic
Outputs
Trimmed
CLK oscillator/
selector
5V Voltage
regulator
Stand Still
Current
Reduction
Analog Scaling
VREF IREF
256 Microstep
Sequencer
stealthChop2
Driver
spreadCycle
22n
50V
charge pump
Full Bridge A
100n
16V
VS
+VM
100n
100n
100µF
Low ESR type
OA1
OA2
N
S
stepper
motor
Integrated IREF
Rsense
Full Bridge B
BRA
Connect directly
to GND plane
Attention:
Start with ENN=high!
Set GCONF.1 or OTP0.6
prior to enabling the driver!
OB1
OB2
BRB
Connect directly
to GND plane
opt. driver enable
Figure 3.2 Application circuit using RDSon based sensing
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