Datasheet

TMC220X, TMC222X DATASHEET (Rev. 1.02 / 2017-MAY-16) 15
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3 Sample Circuits
The sample circuits show the connection of external components in different operation and supply
modes. The connection of the bus interface and further digital signals is left out for clarity.
3.1 Standard Application Circuit
22n
50V
100n
16V
ENN
GND
DIE PAD
microPlyer
Full Bridge A
Full Bridge B
+V
M
VS
stepper
motor
N
S
OA1
OA2
OB1
OB2
Driver
100n
BRB
100µF
CPI CPO
BRA
R
SA
Use low inductivity SMD
type, e.g. 1206, 0.5W for
R
SA
and R
SB
R
SB
100n
VCP VREF
opt. driver enable
stealthChop2
spreadCycle
Integrated
Rsense
IREF
256 Microstep
Sequencer
Stand Still
Current
Reduction
2.2µ
6.3V
5VOUT
Analog current scaling or leave open
Low ESR type
Place near IC with
short path to die pad
Connect directly
to GND plane
Connect directly
to GND plane
VCC_IO
TMC22xx
Step&Dir input
5V Voltage
regulator
charge pump
CLK_IN
opt. ext. clock
10-16MHz
3.3V or 5V
I/O voltage
100n
Analog Scaling
VREF
Programmable
Diagnostic
Outputs
Configuration
Interface
MS1
MS2
SPREAD
INDEX
DIAG
Configuration
(GND or VCC_IO)
Index pulse
Driver error
PDN/UART
B. Dwersteg, ©
TRINAMIC 2016
Trimmed
CLK oscillator/
selector
UART interface
+ Register Block
Configuration
Memory (OTP)
(not with TMC2202)
(only TMC222x)
optional UART interface
IREF
Step Pulse
Generator
STEP
DIR
Step and Direction
motion control
Figure 3.1 Standard application circuit
The standard application circuit uses a minimum set of additional components. Two sense resistors
set the motor coil current. See chapter 8 to choose the right sense resistors. Use low ESR capacitors
for filtering the power supply. The capacitors need to cope with the current ripple cause by chopper
operation. A minimum capacity of 100µF near the driver is recommended for best performance.
Current ripple in the supply capacitors also depends on the power supply internal resistance and
cable length. VCC_IO can be supplied from 5VOUT, or from an external source, e.g. a 3.3V regulator.
Basic layout hints
Place sense resistors and all filter capacitors as close as possible to the related IC pins. Use a solid
common GND for all GND connections, also for sense resistor GND. Connect 5VOUT filtering capacitor
directly to 5VOUT and the die pad. See layout hints for more details. Low ESR electrolytic capacitors
are recommended for VS filtering.
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.