PCA9629PW,118 NXP Semiconductors, PCA9629PW,118 Datasheet - Page 36

• Manufacturer Part Number: PCA9629PW,118
• Description: Motor / Motion / Ignition Controllers & Drivers I2C-bus Stepper motor controller
• Manufacturer: NXP Semiconductors
• Type: Stepper Motor Controllerr

Specifications of PCA9629PW,118

• Rohs: yes
• Product: Stepper Motor Controllers / Drivers
• Operating Supply Voltage: 4.5 V to 5.5 V
• Supply Current: 6 mA
• Mounting Style: SMD/SMT
• Package / Case: TSSOP-16
• Factory Pack Quantity: 2500

NXP Semiconductors
10. Application design-in information
PCA9629
Product data sheet
Fig 18. Typical application
CONTROLLER
MASTER
3.3 V
Device address configured as 0100 0000b for this example.
RST
INT
1.6 kΩ
10.1 Stepper motor coil driver considerations
1.6 kΩ
When choosing a motor and coil driver circuit for an application, it is necessary to choose
the coil driver such that the minimum expected drive strength of the coil driver over the
anticipated operating conditions exceeds the minimum coil current in the application. For
the NMOS FETs, the gate voltage affects the FET drive strength, so it is necessary to
evaluate the FET with its gate at the minimum V
because the PCA9629 cannot drive the gate higher than the V
For example, in most applications a 5 V power supply would have a specification like
5 V  10 % or 5 V  20 %, so it would be necessary to verify that the ON-resistance or
current sinking capability of the FET with a gate voltage of 4.75 V or 4.5 V, whichever
applies, is capable of sinking all of the current that the motor might require. Since FETs
present a capacitive load to the outputs of the PCA9629, the output asymptotically
approaches the V
for Darlington bipolar coil drivers the input current represents a static current load that
reduces the V
the PCA9629 output voltage will always be less than V
current and also reduces the available drive current from the Darlington bipolar coil driver,
so the lowest gain for the driver and the input current gain product must be considered in
verifying that the maximum motor current can be sunk by the driver.
1.1 kΩ
2 kΩ
SCL
SDA
INT
RESET
AD1
AD0
OH
All information provided in this document is subject to legal disclaimers.
PCA9629
. So depending upon the input current of the Darlington bipolar coil driver,
DD
V
V
5 V
DD
SS
of the part, so eventually the full V
OUT3
OUT2
OUT1
OUT0
Rev. 1 — 29 February 2012
P0
P1
P2
P3
position B
generates INTP1
HIGH CURRENT
12 V EXTERNAL
DRIVER
sensor 1
DD
Fm+ I
planned for the PCA9629 application,
stepper motor
DD
DD
electrical
2
C-bus stepper motor controller
. This in turn reduces the input
appears at the output. However,
M
DD
.
generates INTP0
PCA9629
sensor 0
© NXP B.V. 2012. All rights reserved.
position A
002aae760
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