Os motores de busca de Datasheet de Componentes eletrônicos |
|
DS18B20 Folha de dados(PDF) 12 Page - Dallas Semiconductor |
|
DS18B20 Folha de dados(HTML) 12 Page - Dallas Semiconductor |
12 / 22 page DS18B20 12 of 22 COPY SCRATCHPAD [48h] This command copies the contents of the scratchpad TH, TL and configuration registers (bytes 2, 3 and 4) to EEPROM. If the device is being used in parasite power mode, within 10 μs (max) after this command is issued the master must enable a strong pullup on the 1-Wire bus for at least 10ms as described in the Powering the DS18B20 section. RECALL E 2 [B8h] This command recalls the alarm trigger values (TH and TL) and configuration data from EEPROM and places the data in bytes 2, 3, and 4, respectively, in the scratchpad memory. The master device can issue read time slots following the Recall E 2 command and the DS18B20 will indicate the status of the recall by transmitting 0 while the recall is in progress and 1 when the recall is done. The recall operation happens automatically at power-up, so valid data is available in the scratchpad as soon as power is applied to the device. READ POWER SUPPLY [B4h] The master device issues this command followed by a read time slot to determine if any DS18B20s on the bus are using parasite power. During the read time slot, parasite powered DS18B20s will pull the bus low, and externally powered DS18B20s will let the bus remain high. See the Powering the DS18B20 section for usage information for this command. Table 3. DS18B20 Function Command Set COMMAND DESCRIPTION PROTOCOL 1-Wire BUS ACTIVITYAFTER COMMAND IS ISSUED NOTES TEMPERATURE CONVERSION COMMANDS Convert T Initiates temperature conversion. 44h DS18B20 transmits conversion status to master (not applicable for parasite- powered DS18B20s). 1 MEMORY COMMANDS Read Scratchpad Reads the entire scratchpad including the CRC byte. BEh DS18B20 transmits up to 9 data bytes to master. 2 Write Scratchpad Writes data into scratchpad bytes 2, 3, and 4 (TH, TL, and configuration registers). 4Eh Master transmits 3 data bytes to DS18B20. 3 Copy Scratchpad Copies TH, TL, and configuration register data from the scratchpad to EEPROM. 48h None 1 Recall E 2 Recalls TH, TL, and configuration register data from EEPROM to the scratchpad. B8h DS18B20 transmits recall status to master. Read Power Supply Signals DS18B20 power supply mode to the master. B4h DS18B20 transmits supply status to master. Note 1: For parasite-powered DS18B20s, the master must enable a strong pullup on the 1-Wire bus during temperature conversions and copies from the scratchpad to EEPROM. No other bus activity may take place during this time. Note 2: The master can interrupt the transmission of data at any time by issuing a reset. Note 3: All three bytes must be written before a reset is issued. |
Nº de peça semelhante - DS18B20 |
|
Descrição semelhante - DS18B20 |
|
|
Ligação URL |
Privacy Policy |
ALLDATASHEETPT.COM |
ALLDATASHEET é útil para você? [ DONATE ] |
Sobre Alldatasheet | Publicidade | Contato conosco | Privacy Policy | roca de Link | Lista de Fabricantes All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |