AMIS-30623 AMI Semiconductor, Inc., AMIS-30623 Datasheet - Page 21

• Manufacturer Part Number: AMIS-30623
• Description: Lin Microstepping Motordriver
• Manufacturer: AMI Semiconductor, Inc.

AMIS-30623 LIN Microstepping Motordriver
As illustrated in
the output of HW2_Cmp. Figure 12 is showing an example of a practical case where a connection to VBAT is interrupted.
R2VBAT
A resistor is connected between VBAT and HW2. Every 1024 µs S
low and the HW2_Cmp output is high. Assuming the previous state was floating, the internal LOGIC will interpret this as a change of
state and the new state will be High. (see also
state was High, so based on
OPEN
In case the HW2 connection is lost (broken wire, bad contact in connector) the next time S
no current, the output of the corresponding I
in
This prevents false triggering in case of false micro interruptions of the power supply. See also
supply lines
R2GND
If a resistor is connected between HW2 and the GND, a current is sensed every 1024 µs whet S
R converter is low and as a result the HW2_Cmp output switches to High. Again based on the stated diagram in Table 1 one can see
that the state will change to Low. This low state will be interpreted as HW2 address = 0.
AMI Semiconductor – June 2006, Rev 3.0
HW2_Cmp
www.amis.com
Table
"R"-Comp
Condition
DriveHS
DriveLS
State
16 one can see that the state changes to float. This will trigger a motion to secure position after a debounce time of 64 ms.
R
th
Table 16
Tsw = 1024 µs
Tsw_on = 128 µs
the state is depending on the previous state, the condition of the 2 switch controls (DriveLS and DriveHS) and
R2VBAT
Table 16
Figure 12: Timing Diagram Showing the Change in States for HW2 Comparator
the new state remains unchanged. This high state will be interpreted as HW2 address = 1
Table
R converter is High and the HW2_Cmp will be low. The previous state was High. Based
16). The next time S
OPEN
21
BOT
is closed a current is sensed, the output of the I
R2VBAT
BOT
is closed the same conditions are observed. The previous
BOT
is closed this will be sensed. There will be
R2GND
TOP
Electrical transient conduction along
is closed. The output of the top I
t
t
t
t
t
t
Data Sheet
R converter is