STTS2004 datasheet(10/58 Pages) STMICROELECTRONICS

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Serial communications

STTS2004

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DocID024229 Rev 3

Table 2. Device select code

Function

Symbol

Device Type Identifier

(DTI)(1)

Logical Serial

Address (LSA)(2)(3)

R/W

A0 pin(4)

Read temperature registers

RTR

0 or 1

Write temperature registers

WTR

Read EE memory

RSPD

0 or 1

Write EE memory

WSPD

Set write protection, block 0

SWP0

VHV

Set write protection, block 1

SWP1

VHV

Set write protection, block 2

SWP2

VHV

Set write protection, block 3

SWP3

VHV

Clear all write protection

CWP

VHV

Read protection status, block 0(5)

RPS0

0, 1 or VHV

Read protection status, block 1(5)

RPS1

0, 1 or VHV

Read protection status, block 2(5)

RPS2

0, 1 or VHV

Read protection status, block 3(5)

RPS3

0, 1 or VHV

Set EE page address to 0(6)

SPA0

0, 1 or VHV

Set EE page address to 1(6)

SPA1

0, 1 or VHV

Read EE page address(7)

RPA

0, 1 or VHV

Reserved

All other encodings

1. The most significant bit, b7, is sent first.

2. Logical Serial Addresses (LSA) are generated by the combination of inputs on the address pin (refer to Table 1)

3. For backward compatibility with previous devices, the order of block select bits (b3 and b1) are not a simple binary

encoding of the block number

4. A0 pin is driven to 0 = VSS, 1 = VDD or VHV.

5. Reading the block protection status results in Ack when the block is not write-protected, and results in NoAck when the

block is write-protected.

6. Setting the SPD (EEPROM) page address to 0 selects the lower 256 bytes of EEPROM, setting to 1 selects the upper 256

bytes of EEPROM. Subsequent Read EE or Write EE commands operate on the selected EE page.

7. Reading the EE page address results in ACK when the current page is 0 and NACK when the current page is 1.

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