Overview
The L9822E, produced by STMicroelectronics, is an octal low-side solenoid driver designed using Multipower BCD technology. It is particularly suited for driving lamps, relays, and solenoids in automotive environments. The device features eight low RDSon DMOS outputs, each with a very low power consumption, making it ideal for applications requiring efficient power management.
Data transmission to the device is achieved through the Serial Peripheral Interface (SPI) protocol, allowing for serial input and diagnostic output. The device also includes status monitor functions for all output lines, enhancing its reliability and diagnostic capabilities.
Key Specifications
| Parameter | Test Conditions | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|
| RDSon | IO = 1 A @ 25 °C, VCC = 5 V ± 5 % | - | - | 0.5 Ω | Ω |
| Output Self-Limiting Current | Output programmed ON | - | - | 1.05 A | A |
| Turn-on Delay | IO = 500 mA, no reactive load | - | - | 10 µs | µs |
| Turn-off Delay | IO = 500 mA, no reactive load | - | - | 10 µs | µs |
| Quiescent Current | - | - | - | 10 mA | mA |
| Internal Clamping Voltage | - | - | - | 36 V | V |
| Logic Supply Voltage | - | - | - | 5 V ± 5 % | V |
Key Features
- Eight low RDSon DMOS outputs (0.5 Ω @ IO = 1 A @ 25 °C, VCC = 5 V ± 5 %)
- 8-bit serial input data using the Serial Peripheral Interface (SPI) protocol
- 8-bit serial diagnostic output for overload and open circuit conditions
- Output short circuit protection and internal 36 V clamping for each output
- Cascadable with another octal driver
- Low quiescent current (10 mA Max.)
- Multipower BCD technology
- Available in Multiwatt 15 and PowerSO-20 packages
- Chip enable select function (active low)
- Status monitor function available on all output lines
Applications
The L9822E is designed for use in automotive environments, particularly for driving lamps, relays, and solenoids. It is suitable for applications requiring efficient power management and robust diagnostic capabilities. The device can also be used in smart vehicle systems with zonal architectures to support increasingly advanced functions.
Q & A
- What is the L9822E used for?
The L9822E is an octal low-side solenoid driver used for driving lamps, relays, and solenoids in automotive environments.
- What communication protocol does the L9822E use?
The L9822E uses the Serial Peripheral Interface (SPI) protocol for data transmission.
- What is the typical RDSon of the DMOS outputs?
The typical RDSon of the DMOS outputs is 0.5 Ω @ IO = 1 A @ 25 °C, VCC = 5 V ± 5 %.
- What is the maximum output self-limiting current?
The maximum output self-limiting current is 1.05 A.
- Does the L9822E have built-in diagnostic capabilities?
Yes, the L9822E provides 8-bit serial diagnostic output for overload and open circuit conditions.
- Can the L9822E be cascaded with other drivers?
Yes, the L9822E is cascadable with another octal driver.
- What is the internal clamping voltage for each output?
The internal clamping voltage for each output is 36 V.
- What is the logic supply voltage for the L9822E?
The logic supply voltage is 5 V ± 5 %.
- What are the available packages for the L9822E?
The L9822E is available in Multiwatt 15 and PowerSO-20 packages.
- How does the chip enable function work?
The chip enable function is active low, meaning data is transferred from the shift registers to the outputs on the rising edge of this signal.
