E520.03A62AC ELMOS Semiconductor, E520.03A62AC Datasheet - Page 20

• Manufacturer Part Number: E520.03A62AC
• Description: Motor / Motion / Ignition Controllers & Drivers 8x low side driver
• Manufacturer: ELMOS Semiconductor
• Type: Unipolar Stepper Motor Driverr

Specifications of E520.03A62AC

• Rohs: yes
• Product: Stepper Motor Controllers / Drivers
• Operating Supply Voltage: 3.3 V, 5 V
• Supply Current: 5 mA
• Operating Temperature: - 40 C to + 125 C
• Mounting Style: SMD/SMT
• Package / Case: QFN-20
• Number Of Outputs: 8
• Output Current: 300 mA
• Output Voltage: 3 V to 25 V
• Power Dissipation: 2.8 W

Stall Detection
The stall detection logic will generate two status sig-
nals for each motor (see Figure 10). The first signal in-
dicates a potential stall condition and sets the referred
stall warning flag STWx. If STWx is 1
ed that the controller saves the current motor position
for later use.
The second signal called stall error flag STEx indicates
a confirmed stall condition. If STEx is 1
saved position should be considered as the actual me-
chanical position by the controller. This procedure al-
lows to minimise the mismatch between mechanical
stop and the position where STEx is set, which is caused
by the stall detection filters.
The STWx and STEx flags of all stepper motors are cu-
mulated to the ATT flag by an OR combination. This
cumulated flag will be transmitted in the first section
of the SPI return data, independently from the chosen
SPI address. The ATT flag, which indicates a change of
a stall condition to the external controller, will not be
reset automatically. It is cleared every time when the
external controller reads the stall status.
If a stall condition has been confirmed and the related
flag bit STEx is set, the behaviour of the circuit depends
on the configuration of the STOPx control bit, which is
located in the SPI register 1000
•
This document contains information on a pre-production product. ELMOS Semiconductor AG reserves the right to change specifications and information herein without notice.
12 / 8 ChANNeL LOw SIDe DRIveR wITh STALL DeTeCTION
PRODUCTION DATA - JUL 24, 2012
ELMOS Semiconductor AG
If the STOPx bit is 0
does not have any effects on the motor drivers.
The external controller is in charge to stop the mo-
tor movement. If a stall warning or a confirmed
stall condition disappears, the related flags STWx
or STEx will be automatically cleared by the logic
without further acknowledgement by the external
micro-controller.
b
, a confirmed stall condition
b
.
b
, it is recommend-
b
, the previously
Data Sheet
20/29
• If the STOPx bit is 1
In order to allow a combined operation of one or more
stepper motors and universal low side driver modes, a
separate STOPx control bit is available for each motor.
On those channel groups not used for stepper motor
control, the related STOPx bit shall be set to 0
that the stall detection logic interferes with the driver
control.
Stepping Frequency Supervisor
Due to the fact that a constant stepping frequency is a
mandatory prerequisite for correct stall detection, the
IC comprises a stepping frequency supervisor function,
which supports the external controller in finding the
suitable point in time to enable stall detection.
When a stable stepping frequency (less than 3% devi-
ation in a frequency range from 100 to 400 steps per
second) is reached, the FSWx flag is cleared to 0
the stall detection is enabled. If the stepping frequency
supervisor function has detected a continuous series of
32 step commutations with sufficiently low variation
of their stepping period, the FSWx flag will be cleared.
If the variation of stepping periods is too large, this flag
will be set.
will stop the stalled motor by turning off the relat-
ed output drivers. In order to recover from this stall
condition, the external controller has to interrupt
the continuous step frequency, so that the FSWx
flag is set by the frequency supervisor. When FSWx
is set, the stall detection logic is disabled and the
driver outputs can be controlled again.
b
, the confirmed stall condition
e520.01/02/03/08
QM-No.: 25DS0054E.02
b
to avoid
b
and