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UM0563

Architecture of the L9952GXP software driver

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Architecture of the L9952GXP software driver

The software driver for the L9952GXP is independent from the microcontroller which

physically controls the device. It is controlled by the user application layer of the software

driver (see Figure 3).

The glue layer, between the software driver and the low level peripheral drivers of the

microcontroller, is the L9952GXP SPI adaptation layer. This layer adapts the SPI interface of

the software driver to the microcontroller dependent SPI driver. Such a mechanism

decouples the software driver and makes its hardware independent (see Figure 3).

A detailed description of the low level peripheral drivers is ouside the scope of this

document. They are dependent on the microcontroller in question, but, decouple the user

application layer, making it hardware indpendent (see Figure 3). They provide the user

application layer with all the functions necessary to control the L9952GXP device.

A detailed description of the user application layer is also outside the scope of this user

manual. Please refer to the AN2751 (L9952GXP power management system IC application

note) for further details.

Figure 3.

Top level architecture of the L9952GXP software driver and the L9952GXP

device with its associated microcontroller and peripherals

1. User application layer: User software which uses the application programming interface (API) of the

software driver to control the device. Such software is ouside the scope of this document.

2. Software driver for the L9952GXP: The software driver for the L9952GXP which interfaces the user

application layer.

3. L9952GXP SPI adaptation layer: A thin layer which adapts the software driver SPI interface to the

microcontroller dependent SPI driver.

4. Low level peripheral drivers: Provide the user application layer with all the functions necessary to control

the L9952GXP device. They control the peripherals of the microncontroller at the lowest power level.

User application layer (1)

L9952GXP software driver (2)

L9952GXP SPI adaptation

layer (3)

Low level peripheral drivers

(ports, timers, SPI, ...)(4)

Microcontroller

L9952GXP

SPI

Reset

VCC (5 V)

Aux

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