L99MD01 datasheet(25/54 Pages) STMICROELECTRONICS

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L99MD01

Functional description of the SPI

Doc ID 17242 Rev 6

25/54

The <Write Mode> and <Read Mode> operations allow access to the RAM of the device,

i. e. write to control registers or read status information.

A <Read and Clear Status> operation addressed to a device specific status register reads

back and subsequently clear this status register. A <Read and Clear Status> operation with

address 3FH clears all status registers at a time and reads back the <Configuration>

A <Read and Clear Status> operation addressed to an unused RAM address register is

identical to a <Read Mode> operation (in case of unused RAM address, the second byte is

equal to 00H).

<Read Device Information> allows access to the ROM area which contains device related

information such as the product family, product name, silicon version and register width.

The <Global Error Flag> is generated by an OR-combination of all failure events of the

device (i.e. bit 0 to bit 6 of the <Global Status Byte>.

Table 21.

Global status byte

Bit

Description

Polarity

Comment

Software reset or

under/overvoltage

Active high

Depends on bit 5 of <Global Status Byte>:

Bit 5

Bit 0

Set if software reset (SDI stuck at 1

or 0)

Logical OR of the under- /

overvoltage status bits

Overcurrent detected

Active high

Set by any overcurrent event

Open-load detected

Active high

Set by any open-load event

Temp warning

Active high

Thermal shutdown /

chip overload

Active high

Not (chip reset or

communication error)

Active low

Activated by all internal reset events that change

device state or configuration registers (e. g.

software reset, VCC under-voltage, etc.). The bit is

set after a valid communication with any register.

This bit is initially ‘0’ and is set to ‘1’ by a valid SPI

communication

Communication Error

Active high

Bit is set if the number of clock cycles during

CSN = low does not match with the specified

frame width or if an invalid bus condition is

detected (SDI stuck at 1 or 0).

Global Error Flag

Active high

Logic OR combination of all failures in the <Global

Status Byte>.

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