L99H02 datasheet(40/51 Pages) STMICROELECTRONICS

40 / 51 page

Functional description of the SPI

L99H02

40/51

DS12547 Rev 6

Equation 1

Vth = n * (0.31 + m * 0.03) V

The purpose of factor n is to determine the number of external temperature sense diodes (in

series). With factor m the level of the threshold voltage can be fine tuned.

4.7

Read device information (ROM)

The device information is stored at the ROM addresses defined below and it is read using

the corresponding operating code.

The <ID-Header> indicates the product family and specifies how many bytes of device

information are available.

In Table 44 the register is addressable only through a read device information command.



FAM[1:0]: family identifier, FAM[1:0] = [0:1] stands for ASSPs.



NR_PI[5:0]: number of product information bytes.

The <Product Code 1 and 2> represents a unique identifier of the device and version.

In Table 45 the register is addressable only through a read device information command.

In Table 46 the register is addressable only through a read device information command.

Table 43. Read device information (ROM)

Op code

Address

Device information

OC1

OC0

00H

<ID-Header>

01H

02H

03H

<SPI-frame-ID>

3FH

Reserved, accessing this address is recognized as a failure, the

device enters a fail-safe state (see Table 30: Global Status Byte).

Table 44. Address 0 <00(hex)>: ID-header - read only

Bit

543

Name

FAM_1

FAM_0

NR_PI_5

NR_PI_4 NR_PI_3

NR_PI_2 NR_PI_1

NR_PI_0

000

Table 45. Address 1 <01(hex)>: product ID (LSB) - read only

Bit

76543210

Name

PR_ID_7 PR_ID_6 PR_ID_5 PR_ID_4 PR_ID_3 PR_ID_2 PR_ID_1 PR_ID_0

00000001

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