Rainbow-electronics DS2770 Manual de usuario descargar pdf (Pagina 21)

DS2770

21 of 27

FUNCTION COMMANDS Table 3

COMMAND DESCRIPTION

COMMAND

PROTOCOL

BUS STATE AFTER

COMMAND

PROTOCOL

BUS DATA

Read Data

Reads data from

memory map starting

at address XX

69h, XX Master R

Unlimited

Write Data

Writes data to memory

starting at address XX 6Ch, XX Master Tx Unlimited

Copy Data

Copies shadow RAM

data to EEPROM

block that begins with

address location XX

48h, XX Master Reset None

Recall Data

Recalls EEPROM

block that begins with

address location XX to

shadow RAM

B8h, XX Master Reset None

Lock

Permanently locks the

block of lockable

EEPROM memory

that begins with

address location XX

6Ah, XX Master Reset None

Refresh

Restores Status

data

63h Master Reset None

Start Charge

Initiates charge

through the host

interface.

B5h Master Reset None

Stop Charge

Terminates charge

through the host

interface.

BEh Master Reset None

I/O SIGNALING

The 1-Wire bus requires strict signaling protocols to insure data integrity. The DS2770 uses the following

four protocols: the initiation sequence (reset pulse followed by presence pulse), Write 0, Write 1, and

Read Data. All of these types of signaling except the presence pulse are initiated by the bus master.

Figure 18 shows the initialization sequence required to begin any communication with the DS2770. A

presence pulse following a reset pulse indicates the DS2770 is ready to accept a Net Address command.

The bus master transmits (T

) a reset pulse for t

RSTL

. The bus master then releases the line and goes into

Receive Mode (R

). The 1-Wire bus line is then pulled high by the pull-up resistor. After detecting the

rising edge on the DQ pin, the DS2770 waits for the t

PDH

and then transmits the presence pulse for t

PDL

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 27

Comentarios a estos manuales

Sin comentarios

Rainbow-electronics DS2770 Manual de usuario Pagina 21

Comentarios a estos manuales

Relacionado con productos y manuales para Panel De Control Rainbow-electronics DS2770