L99H01XP datasheet(41/53 Pages) STMICROELECTRONICS

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L99H01

Functional description of the SPI

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 is read using the

respective operating code.

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

information are available.

•

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.

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: STK_RESET_Q).

Table 44. Address 0 <00(hex)> : ID-header - read only(1)

Addressable only through a read device information command.

Bit

43210

Name

FAM_1

FAM_0

NR_PI_5

NR_PI_4

NR_PI_3

NR_PI_2

NR_PI_1

NR_PI_0

00010

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

Addressable only through a read device information command.

Bit

543

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

000

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