Overview
The L9958XPTR, produced by STMicroelectronics, is an SPI-controlled H-Bridge designed for the control of DC and stepper motors in safety-critical applications and under extreme environmental conditions. This device is particularly suited for automotive and other high-reliability environments due to its robust protection features and advanced diagnostics capabilities.
The H-Bridge is protected against over-temperature, short circuits, and undervoltage lockout for all supply voltages. It also features integrated free-wheel diodes and the ability to detect open-load conditions, making it highly versatile and reliable.
Key Specifications
| Parameter | Value | Notes |
|---|---|---|
| Operating Battery Supply Voltage | 4.0 V to 28 V | |
| Operating Vdd Supply Voltage | 4.5 V to 5.5 V | |
| Pins Withstand Voltage | 19 V (all pins), 40 V (Vs and output pins) | |
| Full Path Ron | 100 mΩ (at Tj = -40 °C) to 300 mΩ (at Tj = 150 °C) | |
| Logic Inputs Compatibility | TTL/CMOS-compatible | |
| Operating Frequency | Up to 20 kHz | |
| SPI Interface | 16-bit, configuration/diagnostics, daisy chain capability | |
| Current Regulation Peak Threshold | 2.5 A to 8.6 A (Typ.), in 4 steps | Set by SPI |
| Package Options | PowerSO-20, PowerSO16, PowerSSO24 | JEDEC standards MO166, MO271A |
Key Features
- Programmable current regulation peak threshold by SPI up to 8.6 A typ.
- Over temperature and short circuit protection
- VS undervoltage disable function, Vdd undervoltage and overvoltage protection
- Open-load detection in ON condition, full diagnostics in OFF state
- Enable and disable input, low standby current (<10 μA)
- Voltage and current slew-rate control for low EMI, programmable through SPI
- Integrated free-wheel diodes, low side transistor switched on in parallel of its diode to reduce power dissipation during free-wheeling conditions
- Detailed failure diagnostics on each channel via SPI: short circuit to battery, short circuit to ground, short circuit overload, over temperature
Applications
The L9958XPTR is primarily used in safety-critical applications, particularly in the automotive sector. It is suitable for controlling DC and stepper motors under extreme environmental conditions. Other potential applications include industrial automation, medical devices, and any system requiring robust motor control with advanced diagnostics and protection features.
Q & A
- What is the operating voltage range for the L9958XPTR?
The operating battery supply voltage is 4.0 V to 28 V, and the operating Vdd supply voltage is 4.5 V to 5.5 V.
- What types of protection does the L9958XPTR offer?
The device is protected against over-temperature, short circuits, and undervoltage lockout for all supply voltages. It also includes Vdd undervoltage and overvoltage protection.
- How does the L9958XPTR handle current regulation?
The current regulation peak threshold can be set by SPI from 2.5 A to 8.6 A (Typ.) in 4 steps. The current limitation threshold is linearly reduced by temperature over 165 °C, and a thermal warning bit is set by SPI.
- What is the significance of the SPI interface in the L9958XPTR?
The 16-bit SPI interface is used for configuration, diagnostics, and daisy chain capability. It provides detailed failure diagnostics on each channel, including short circuit to battery, short circuit to ground, short circuit overload, and over temperature.
- What are the package options available for the L9958XPTR?
The device is available in three power packages: PowerSO-20, PowerSO16, and PowerSSO24, adhering to JEDEC standards MO166 and MO271A.
- How does the L9958XPTR manage free-wheeling conditions?
During free-wheeling conditions, the low side transistor is switched on in parallel with its diode to reduce power dissipation.
- What is the operating frequency of the L9958XPTR?
The device can operate up to a frequency of 20 kHz.
- Does the L9958XPTR support open-load detection?
Yes, the device can detect open-load conditions in the ON state.
- What is the standby current of the L9958XPTR?
The standby current is less than 10 μA.
- Is the L9958XPTR compatible with TTL/CMOS logic inputs?
Yes, the device has TTL/CMOS-compatible logic inputs.
