E-L9935 STMicroelectronics, E-L9935 Datasheet - Page 23

• Manufacturer Part Number: E-L9935
• Description: IC STEPPER MOTOR DVR 2PH 20PWRSO
• Manufacturer: STMicroelectronics
• Type: 2 Phase Stepper Motor Driverr

Specifications of E-L9935

• Applications: Stepper Motor Driver, 2 Phase
• Number Of Outputs: 1
• Current - Output: ±1.2A
• Voltage - Supply: 8 V ~ 24 V
• Operating Temperature: -40°C ~ 150°C
• Mounting Type: Surface Mount
• Package / Case: PowerSO-20 Exposed Bottom Pad
• Product: Stepper Motor Controllers / Drivers
• Operating Supply Voltage: 14.4 V
• Supply Current: 4.5 mA
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Load: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

L9935
5.16
Table 10.
1. Motor resistance approximately 10Ω and V
bit 76543210 76543210
Lower resistivity of the motor may lead to detection of short to ground on both branches of the bridge leading to code 10 on
all steps.
XX111111
XX011011
XX010011
XX010010
XX011010
XX011011
XX010011
XX010010
XX011010
SDI
-
Application information
For driving a stepper motor we suggest to use the following codes. The columned ’SDO
correct’ shows the data returned at SDO in correct function. The columns presented under
’Error cases’ display the diagnosis bits if errors are detected.
Examples of control sequences.
Full step mode control sequences and diagnosis response
These sequences are intended to give the user a good starting point for his software
development. Besides these two there are further possibilities how to implement control
sequences for this device (other currents, quarters step etc.).
Double errors: Double errors will create composite codes by an AND operation between
columns of the same dominance. Open and short to VS are the least dominant error codes.
(first 6 error code columns). Short to ground is the second dominant error code. detection of
short to gnd will overwrite error codes of the least dominant kind (open, short to VS).
Temperature pre alarm and thermal shut down are the most dominant error codes. Thermal
pre alarm returns error code 00 but the device still is working and returns the appropriate
operation code (bits 0..5).
Thermal shut down returns error code 00 and turns off the device. The opcode returned
corresponds the action eventually performed (bit 0..5 become 1).
For example open bridge A and simultaneously open bridge B will lead to error code 01 by
performing an AND operation between the two corresponding columns.
11111111
11011011
11010011
11010010
11011010
11011011
11010011
11010010
correct
SDO
-
76
11
11
01
11
01
11
01
11
O
N
A
P
E
SDO present last data or 11111111 in case prev. state was standby
76
11
11
11
01
11
01
11
01
O
B
P
E
N
S
= 12V. So a short to ground only is detected on one branch of the bridge.
VS
A1
76
11
11
01
01
01
11
01
01
H
O
R
S
T
Doc ID 5198 Rev 9
A2
VS
76
11
01
01
11
01
01
01
11
O
S
H
R
T
Error cases and SDObit7, bit6
VS
B1
76
11
11
11
01
01
01
11
01
H
O
R
S
T
VS
B2
76
11
01
01
01
11
01
01
01
O
S
H
R
T
GND
A1
76
11
10
01
11
10
10
01
11
(1)
H
O
R
S
T
GND
A2
76
11
11
10
10
01
11
10
10
(1)
O
S
H
R
T
GND
B1
76
11
10
10
01
11
10
10
01
(1)
H
O
R
S
T
Functional description
GND
B2
76
11
11
11
10
10
01
11
10
(1)
H
O
R
S
T
therm.
alarm
76
00
00
00
00
00
00
00
00
shut down
76543210
00111111
00111111
00111111
00111111
00111111
00111111
00111111
00111111
operating
codes)
therm.
(reset
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