L9958SB STMicroelectronics, L9958SB Datasheet - Page 19

• Manufacturer Part Number: L9958SB
• Description: IC H-BRIDGE SPI POWERSO16
• Manufacturer: STMicroelectronics

Specifications of L9958SB

• Applications: DC Motor Driver, Brushless (BLDC)
• Number Of Outputs: 2
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: PowerSO-16 Exposed Bottom Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Output: -
• Voltage - Load: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

L9958
5
5.1
5.1.1
5.1.2
Diagnostics and protections
A detailed diagnostic of the H-bridge is available through SPI communication. The 16 bits
diagnostic word is sent back to the MCU in return of a command word. The diagnostic word
is used to report two kinds of information:
●
●
Diagnosis reset strategy
Reset requests
Except "ACT" and "VS_UV" bits, all the others are latched and can only be released by:
●
●
●
When the diagnostic register is reset, the bridge is switched back to normal mode driven by
DIR and PWM. All the settings are kept as before the failure. In case of SPI read, no
additional action on DI / EN is needed.
Diagnosis reset bit
In case of "DR" set to LOW (default value), all the bits of the diagnostic register can be reset
by the three possibilities described in previous section.
In case of "DR" set to HIGH, the over-current, Vdd over-voltage and over-temperature
diagnostic bits can NOT be reset by SPI read and therefore, the bridge is kept in tri-state
until a transition from "Disable" to "Enable" on DI/EN pins or Power-on-Reset condition.
Table 11.
DR
H-Bridge failures:
–
–
–
–
–
–
H-bridge functional status:
–
–
–
Transition from "Disable" to "Enable" on DI / EN pins,
Diagnostic register read by SPI (see details on each failure release) depending on bit
"DR",
Power-On-Reset condition.
0
1
Over-current on each transistor in on-state,
Vps under-voltage,
Vdd over-voltage,
Over-temperature,
Open-load in on-state,
Off-state diagnostic.
Current limitation condition,
Current limitation decreasing condition,
Disable / Enable status.
All diagnostic bits reset at each SPI reading (Default)
Over current bits (8..11) + Temp. shutdown TSD bit (6) + Vdd over voltage bit (3) NOT
reset by SPI
Diagnosis
reset strategy
Doc ID 17269 Rev 2
Diagnosis reset strategy
Diagnostics and protections
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