TMC5161 DATASHEET (Rev. 1.01 / 2018-NOV-20)
15
3 Sample Circuits
The following sample circuits show the required external components in different operation and
supply modes. The connection of the bus interface and further digital signals are left out for clarity.
3.1 Standard Application Circuit
+VM
Optional use lower
voltage down to 12V
22n
100V
100n
16V
100n
470n
CE
+VM
VSA
12VOUT
5VOUT
CB2
CB
CB
charge pump
HS
HS
11.5V Voltage
regulator
reference switch
processing
CB1
100n
2.2µ
2.2µ
5V Voltage
regulator
2R2
OB1
OB2
VCC
470n
TMC5161
LS
LS
RSB
CSN
SCK
SDI
SRBH
SPI interface
47R
47R
RS
N
stepper
motor
SDO
SRBL
CA2
S
Controller
Chopper
DIAG / INT out
and
Single wire
interface
B.Dwersteg, ©
TRINAMIC 2014
DIAG1/SWP
DIAG0/SWN
CB
CB
HS
HS
CA1
opt. ext. clock
12-16MHz
OA1
OA2
CLK_IN
VCC_IO
+VIO
LS
LS
Keep inductivity of the fat
interconnections as small
as possible to avoid
3.3V or 5V
I/O voltage
RSA
100n
undershoot of BM <-5V!
SRAH
Encoder
unit
47R
47R
Use low inductivity SMD
type, e.g. 1210 or 2512
mode selection
A
B
N
RS
SRAL
resistor for RS
!
pd
pd
pd
Bootstrap capacitors CB:
220nF to 470nF, 16V
Encoder input /
dcStep control in S/D
mode
+VIO
Both GND: UART mode
+VIO
opt. driver enable
Figure 3.1 Standard application circuit
The standard application circuit uses a minimum set of additional components. Eight MOSFETs are
selected for the desired current, voltage and package type. Two sense resistors set the motor coil
current. See chapter 9 to choose the right value for sense resistors. Use low ESR capacitors for
filtering the power supply. A minimum capacity of 100µF per ampere of coil current near to the power
bridge is recommended for best performance. The capacitors need to cope with the current ripple
caused by chopper operation. 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. In order to minimize linear voltage regulator power dissipation of the
internal 5V and 11.5V voltage regulators in applications where VM is high, a different (lower) supply
voltage should be used for VSA (see chapter 3.2).
Basic layout hints
Place sense resistors and all filter capacitors as close as possible to the power MOSFETs. Place the
TMC5161 near to the MOSFETs and use short interconnection lines in order to minimize parasitic trace
inductance. Use a solid common GND for all GND, GNDA and GNDD connections, also for sense
resistor GND. Connect 5VOUT filtering capacitor directly to 5VOUT and GNDA pin. See layout hints for
more details. Low ESR electrolytic capacitors are recommended for VS filtering.
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