Rainbow-electronics DS7505 Manual de usuario descargar pdf (Pagina 12)

DS7505

Copy Data [48h] 0100 1000

Copies data from all SRAM shadow registers to

EEPROM. It is recommended that a Copy Data com-

mand be performed after writing EEPROM-backed

memory locations to guarantee data integrity in the

event of a power loss. The master sends a START fol-

lowed by an address byte containing the DS7505 bus

address. The R/W bit must be a 0. The DS7505

responds with an ACK. If the next byte is a 0x48, the

DS7505 copies all Shadow RAM locations in EEPROM

memory.

Software POR [54h] 0101 0100

The master sends a START followed by an address

byte containing the DS7505 bus address. The R/W bit

must be a 0. The DS7505 responds with an ACK. If the

next byte is a 0x54, the DS7505 resets as if power had

been cycled, which stops temperature conversions and

resets all registers to their power-up states. No ACK is

sent by the IC after the POR command is received.

Afterwards, the DS7505 makes a single temperature

conversion or continuous temperature conversions,

depending on the state of the SD bit.

Digital Thermometer and Thermostat

12 ______________________________________________________________________________________

SCL

START ADDRESS BYTE

A) READ 2 BYTES FROM THE TEMPERATURE, T

, OR T

HYST

SDA S 1 0 0 1 A2 A1 A0 R A A N PD7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0

MS DATA BYTE

(FROM SLAVE)

LS DATA BYTE

(FROM SLAVE)

ACK

(SLAVE)

ACK

(MASTER)

NACK

(MASTER)

STOP

SCL

START ADDRESS BYTE

E) READ FROM THE CONFIGURATION REGISTER (CURRENT POINTER LOCATION)

SDA S 1 0 0 1 A2 A1 A0 R A N PD7 D6 D5 D4 D3 D2 D1 D0

MS DATA BYTE

(FROM SLAVE)

ACK

(SLAVE)

NACK

(MASTER)

STOP

SCL

START ADDRESS BYTE

B) WRITE TO THE CONFIGURATION REGISTER

SDA S 1 0 0 1 A2 A1 A0 W A A A P0 0 0 0 0 0 0 1 D7 D6 D5 D4 D3 D2 D1 D0

POINTER BYTE DATA BYTE

(FROM MASTER)

ACK

(SLAVE)

ACK

(SLAVE)

ACK

(SLAVE)

STOP

SCL

START ADDRESS BYTE

C) WRITE TO THE T

OR T

HYST

SDA S 1 0 0 1 A2 A1 A0 W A A0 0 0 0 0 0 P1 P0 D7 D6 D5 D4 D3 D2 D1 D0

POINTER BYTE MS DATA BYTE

(FROM MASTER)

ACK

(SLAVE)

ACK

(SLAVE)

AAPD7 D6 D5 D4 D3 D2 D1

LS DATA BYTE

(FROM MASTER)

ACK

(SLAVE)

ACK

(SLAVE)

STOP

SCL

START ADDRESS BYTE

D) READ SINGLE BYTE (NEW POINTER LOCATION)

SDA S 1 0 0 1 A2 A1 A0 W A A S0 0 0 0 0 0 P1 P0 1 0 0 1 A2 A1 A0

POINTER BYTE ADDRESS BYTEACK

(SLAVE)

ACK

(SLAVE)

REPEAT

START

RA N PD7 D6 D5 D4 D3 D2 D1 D0

DATA BYTE

(FROM SLAVE)

ACK

(SLAVE)

NACK

(MASTER)

STOP

Figure 9. 2-Wire Interface Timing

1 2 ... 7 8 9 10 11 12 13 14

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Rainbow-electronics DS7505 Manual de usuario Pagina 12

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