Overview
The L9958TR, 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.
Key Specifications
| Parameter | Value |
|---|---|
| Operating Battery Supply Voltage | 4.0 V to 28 V |
| Operating Vdd Supply Voltage | 4.5 V to 5.5 V |
| Current Regulation Peak Threshold | 2.5 A to 8.6 A (Typ.), in 4 steps |
| Full Path Ron | 100 mΩ (at Tj = -40 °C) to 300 mΩ (at Tj = 150 °C) |
| Logic Inputs | TTL/CMOS-compatible |
| Operating Frequency | Up to 20 kHz |
| SPI Interface | 16-bit, configuration/diagnostics, daisy chain capability |
| Protection Features | Over temperature, short circuit, VS undervoltage disable, Vdd undervoltage and overvoltage protection |
| Package Options | PowerSO-20, PowerSO16, PowerSSO24 |
| Standby Current | <10 μA |
Key Features
- Programmable current regulation peak threshold by SPI up to 8.6 A typ.
- Integrated free-wheel diodes with low side transistor switching to reduce power dissipation during free-wheeling conditions.
- Detailed failure diagnostics on each channel via SPI, including short circuit to battery, short circuit to ground, short circuit overload, and over temperature.
- Open-load detection in ON condition.
- Full diagnostics in OFF state.
- Enable and disable input.
- Voltage and current slew-rate control for low EMI, programmable through SPI.
- Available in three power packages: PowerSO-20, PowerSO16, and PowerSSO24.
Applications
The L9958TR is designed for 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 primary function of the L9958TR?
The L9958TR is an SPI-controlled H-Bridge designed for controlling DC and stepper motors. - What are the operating voltage ranges for the L9958TR?
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 protection features does the L9958TR have?
The device has over temperature, short circuit, VS undervoltage disable, Vdd undervoltage, and Vdd overvoltage protection features. - How is current regulation managed on the L9958TR?
Current regulation peak threshold can be set by SPI from 2.5 A to 8.6 A (Typ.), in 4 steps. - What is the significance of the integrated free-wheel diodes?
The integrated free-wheel diodes reduce power dissipation during free-wheeling conditions by switching on the low side transistor in parallel with its diode. - What diagnostic capabilities does the L9958TR offer?
The device provides detailed failure diagnostics on each channel via SPI, including short circuit to battery, short circuit to ground, short circuit overload, and over temperature. - Can the L9958TR detect open loads?
Yes, the L9958TR can detect open loads in the ON condition. - What is the standby current of the L9958TR?
The standby current is less than 10 μA. - How does the L9958TR manage EMI?
The device offers voltage and current slew-rate control for low EMI, which is programmable through SPI. - In what packages is the L9958TR available?
The L9958TR is available in PowerSO-20, PowerSO16, and PowerSSO24 packages.
