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DS1825UTR Datasheet(PDF) 8 Page - Maxim Integrated Products |
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DS1825UTR Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 21 page DS1825 Programmable Resolution 1-Wire Digital Thermometer With 4-Bit ID 8 of 21 Byte 8 of the scratchpad is read-only and contains the cyclic redundancy check (CRC) code for bytes 0 through 7 of the scratchpad. The DS1825 generates this CRC using the method described in the CRC GENERATION section. Data is written to bytes 2, 3, and 4 of the scratchpad using the Write Scratchpad [4Eh] command; the data must be transmitted to the DS1825 starting with the least significant bit of byte 2. To verify data integrity, the scratchpad can be read (using the Read Scratchpad [BEh] command) after the data is written. When reading the scratchpad, data is transferred over the 1-Wire bus starting with the least significant bit of byte 0. To transfer the TH, TL, and configuration data from the scratchpad to EEPROM, the master must issue the Copy Scratchpad [48h] command. Data in the EEPROM registers is retained when the device is powered down; at power-up the EEPROM data (including the hard-wired address inputs AD0-AD3)is reloaded into the corresponding scratchpad locations. Data can also be reloaded from EEPROM to the scratchpad at any time using the Recall E 2 [B8h] command. The master can issue read time slots following the Recall E 2 command and the DS1825 will indicate the status of the recall by transmitting 0 while the recall is in progress and 1 when the recall is done. Figure 7. DS1825 MEMORY MAP SCRATCHPAD (Power-up State) byte 0 Temperature LSB (50h) byte 1 Temperature MSB (05h) EEPROM byte 2 TH Register or User Byte 1 TH Register or User Byte 1 byte 3 TL Register or User Byte 2 TL Register or User Byte 2 byte 4 Configuration Register* Configuration Register* byte 5 Reserved byte 6 Reserved byte 7 Reserved byte 8 CRC * Lower four bits of Configuration Register are hardwired through AD0-AD3 CONFIGURATION REGISTER Byte 4 of the scratchpad memory is the configuration register, as shown in Figure 8. The configuration register allows the user to set the conversion resolution using the R0 and R1 bits and read the programmed value of the address pins. The conversion resolution power-up default is R0 = 1 and R1 = 1 (12-bit resolution). Table 4 shows the resolution configuration settings and maximum conversion time. Note that there is a direct tradeoff between resolution and conversion time. AD0-AD3 bits report the pin programmed location information and are sampled at power-up. In Parasite Power mode, the address pins must be connected to DQ or GND and in VDD powered mode, the address pins must be connected to VDD or GND. Pins tied to DQ/VDD are reported with a logical 1 and pins tied to GND are reported as a logical 0. Pins connected to DQ/ VDD or GND through a resistor are valid logical 1s or logical 0s if the resistor is less than 10k. Floating or high impedance (>10k W) connections are indeterminate. Bit 7 and Bit 4 of the configuration register are reserved for internal use and cannot be overwritten. Figure 8. CONFIGURATION REGISTER FORMAT Note: Bit 0 through Bit 3 are programmed through the four Location Programming Address pins AD0-AD3. Reading the configuration register provides location information on up to 16 individual DS1825s. bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 0 R1 R0 1 AD3 AD2 AD1 AD0 (85°C) |
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