Datasheet

TMC2100 DATASHEET (Rev. 1.07 / 2017-MAY-15) 13
www.trinamic.com
4.4.2 Internal Regulator Bridged
In case a clean external 5 V 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 5 mV. 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.
5V Voltage
regulator
+5V
5VOUT
VSA
4.7µ
VCC
470n
10R
Well-regulated, stable
supply, better than +-5%
Figure 4.4 Using an external 5V supply to bypass internal regulator
4.5 5V Only Supply
VCC_IO
TMC2100
Step&Dir input
with microPlyer
STEP DIR
5V Voltage
regulator
charge pump
22n
63V
100n
16V
CLK_IN
+V
IO
GNDP
GNDA
TST_MODE
DIE PAD
opt. ext. clock
12-16MHz
3.3V or 5V
I/O voltage
100n
Sequencer
Full Bridge A
Full Bridge B
+5V
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
R
SB
100n
VCP
DAC Reference
AIN_IREF
IREF
Use low inductivity SMD
type, e.g. 1206, 0.5W
Status out
(open drain)
Configuration
interface
with TRISTATE
detection
CFG0
CFG1
CFG3
CFG2
ERROR
INDES
TRISTATE configuration
(GND, VCC_IO or open)
Index pulse
Driver error
CFG4
CFG5
DRV_ENN_CFG6
Opt. driver
enable input
GNDD
B.Dwersteg, ©
TRINAMIC 2014
GNDD
leave open
+5V
5VOUT
VSA
4.7µ
VCC
470n
Figure 4.5 5V only operation
While the standard application circuit is limited to roughly 5.5 V lower supply voltage, a 5 V only
application lets the IC run from a normal 5 V +/-5% supply. In this application, linear regulator drop
must be minimized. Therefore, the major 5 V 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.