Datasheet

TMC2300 DATASHEET (Rev. 1.02 / 2019-NOV-06) 11
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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. The
TMC2300 is configured for different application modes by two pins, as well as by settings available via
the UART interface.
STEPPER/MODE: CONFIGURATION OF OPERATION MODE
STEPPER
MODE
Operation Mode
VCC_IO
GND
UART controlled stepper driver, MS1 and MS2 select the UART address.
VCC_IO
VCC_IO
Standalone Stepper. Set power down mode using PDN, and microstep
resolution using MS1 and MS2.
3.1 Standard Application Circuit
1n-100n
10V
EN
GND
DIE PAD
MicroPlyer
Full Bridge A
Full Bridge B
+V
M
VS
stepper
motor
N
S
OA1
OA2
OB1
OB2
BRB
BRA
R
SA
Use low inductivity SMD
type for R
SA
and R
SB
R
SB
100n
VCP
opt. driver enable
StealthChop2
current
controller
256 Microstep
Sequencer
Stand Still
Current
Reduction
100n
1.8VOUT
Place near IC with
short path to die pad
Connect directly
to GND plane
Connect directly
to GND plane
VIO/
NSTDBY
TMC2300
Step&Dir input
1.8V Voltage
regulator
Internal charge
pump
1.8V to 5V
I/O voltage
/ standby
100n
Programmable
Diagnostic
Output
Configuration
Interface
AD0
AD1
STEPPER
DIAG
UART Address setting
Driver error /
Index pulse /
Stall
UART
B. Dwersteg, ©
TRINAMIC 2016
UART interface
+ Register Block
UART interface
Step Pulse
Generator
STEP
DIR
Step and Direction
motion control
StallGuard4
CoolStep
Standby
detector
Optional external
capacitor
BRA
BRB
+V
IO
MODE
STANDBY
STANDBY
CLK oscillator
500k
10µ
Or low ESR >100µF
electrolytic / depending
on supply resistance
and motor current
Figure 3.1 Standard Application Circuit for 2V to 11V Supply
The standard application circuit uses a minimum set of additional components to operate a stepper
motor. Two sense resistors set the motor coil current. See chapter 8 to choose the right sense
resistors. Take care to keep power supply ripple due to chopper operation at a few 100mV, max.,
especially when low voltage operation is desired. Use a ceramic, or low ESR capacitors for filtering
the power supply. The capacitors need to cope with the current ripple caused by chopper operation. A
minimum capacity of 100µF electrolytic, or 10µF ceramic capacitor near the driver is recommended to
keep ripple low. Actual demand will depend on the internal power supply resistance and the desired
motor current. VCC_IO can be supplied from a separate supply, e.g. a 3.3V regulator, or be driven by a
microcontroller port pin. AD0 and AD1 set the UART address. A charge pump capacitor can be added
for slightly reduced power dissipation when operating near the lower voltage limit of roughly 2V.
Basic layout and component 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 1.8VOUT filtering capacitor
directly to 1.8VOUT and the GND pin. See layout hints for more details. Low ESR electrolytic capacitors
are recommended for VS filtering unless supply resistance is very low.