TMC2100 DATASHEET (Rev. 1.07 / 2017-MAY-15)
13
4.4.2 Internal Regulator Bridged
In case a clean external 5V supply is available, it can be used for supply of analog and digital part
(Figure 4.4). The circuit will benefit from a well-regulated supply, e.g. when using a +/-1% regulator. A
precise supply guarantees increased motor current precision, because the voltage on 5VOUT directly is
used as reference for all internal units of the driver, especially for motor current control. For best
performance, the power supply should have low ripple to give a precise and stable supply at 5VOUT
pin with remaining ripple well below 5mV. Some switching regulators have a higher remaining
ripple, or different loads on the supply may cause lower frequency ripple. In this case, increase
capacity attached to 5VOUT. In case the external supply voltage has poor stability or low frequency
ripple, this would affect the precision of the motor current regulation as well as add chopper noise.
Well-regulated, stable
supply, better than +-5%
+5V
VSA
5V Voltage
regulator
5VOUT
4.7µ
10R
VCC
470n
Figure 4.4 Using an external 5V supply to bypass internal regulator
4.5 5V Only Supply
22n
63V
100n
16V
+5V
+5V
VS
VSA
5V Voltage
regulator
100n
100n
100µF
charge pump
Full Bridge A
Step&Dir input
with microPlyer
5VOUT
DAC Reference
IREF
4.7µ
VCC
OA1
OA2
470n
N
stepper
motor
CFG0
CFG1
CFG2
CFG3
CFG4
CFG5
S
Use low inductivity SMD
type, e.g. 1206, 0.5W
Configuration
interface
with TRISTATE
detection
TRISTATE configuration
(GND, VCC_IO or open)
RSA
Driver
BRA
Sequencer
Opt. driver
enable input
B.Dwersteg, ©
TRINAMIC 2014
DRV_ENN_CFG6
OB1
OB2
INDES
ERROR
Full Bridge B
Index pulse
Driver error
Status out
(open drain)
TMC2100
opt. ext. clock
12-16MHz
CLK_IN
VCC_IO
Use low inductivity SMD
type, e.g. 1206, 0.5W
+VIO
RSB
BRB
3.3V or 5V
I/O voltage
100n
leave open
Figure 4.5 5V only operation
While the standard application circuit is limited to roughly 5.5V lower supply voltage, a 5V only
application lets the IC run from a normal 5V +/-5% supply. In this application, linear regulator drop
must be minimized. Therefore, the major 5V load is removed by supplying VCC directly from the
external supply. In order to keep supply ripple away from the analog voltage reference, 5VOUT should
have an own filtering capacity and the 5VOUT pin does not become bridged to the 5V supply.
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