ds7505 Maxim Integrated Products, Inc., ds7505 Datasheet
ds7505
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ds7505 Summary of contents
Page 1
... A 9-bit resolution mode is software compatible with the LM75. Communication with the DS7505 is achieved through a simple 2-wire serial interface. Three address pins allow up to eight DS7505 devices to operate on the same 2-wire bus, which greatly simplifies distributed temperature-sensing applications. The DS7505 thermostat has a dedicated open-drain out- put (O ...
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Digital Thermometer and Thermostat ABSOLUTE MAXIMUM RATINGS Voltage Range on VDD Relative to Ground ..........-0.3V to +4.0V Voltage Range on Any Other Pin Relative to Ground.............................................-0.3V to +6.0V Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage ...
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... See the timing diagram (Figure 1). All timing is referenced to 0 Note 10: After this period, the first clock pulse is generated. Note 11: The DS7505 provides an internal hold time of at least 75ns on the SDA signal to bridge the undefined region of SCL’s falling edge. Note 12: For example ...
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... PRECISION REFERENCE VDD SCL SDA ADDRESS A0 AND I/O CONTROL A1 A2 GND Figure 2. Block Diagram 4 _______________________________________________________________________________________ FUNCTION SU:DAT t HD:STA t SU:STA SR OVERSAMPLING DIGITAL MODULATOR DECIMATOR CONFIGURATION REGISTER TEMPERATURE REGISTER T AND T THERMOSTAT OS HYST REGISTERS COMPARATOR DS7505 Pin Description BUF t SU:STO O.S. ...
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... Bits 3 through 0 of the temperature register are hard- wired to 0. When the DS7505 is configured for 12-bit resolution, the 12 MSBs (bits 15 through 4) of the tem- perature register contain temperature data. For 11-bit resolution, the 11 MSBs (bits 15 through 5) of the tem- perature register contain data, and bit 4 reads out as 0 ...
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... The active state of the O.S. output can be programmed by the POL bit in the configuration register. The power- up factory default is active low (POL = 0). If the user does not wish to use the thermostat capabili- ties of the DS7505, the O.S. output should be left unconnected. Note that if the thermostat is not used, the T and T OS storage of system data ...
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... In interrupt mode, the O.S. output first becomes active when the measured temperature exceeds the T value a consecutive number of times equal to the FT value in the configuration register. Once activated, O.S. can only be cleared by either putting the DS7505 into shutdown mode or by reading from any register (tem- perature, configuration Once O ...
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... Digital Thermometer and Thermostat Configuration Register The configuration register allows the user to program various DS7505 options such as conversion resolution, thermostat fault tolerance, thermostat polarity, thermo- stat operating mode, and shutdown mode. The configu- ration register is arranged as shown in Figure 5 and detailed descriptions of each bit are provided in Table 2 ...
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... Register Pointer The four DS7505 registers each have a unique 2-bit pointer designation, which is defined in Table 5. When reading from or writing to the DS7505, the user must “point” the DS7505 to the register that accessed. When reading from the DS7505, once the pointer is set, it remains pointed at the same register until it is changed ...
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... Digital Thermometer and Thermostat Slave Address: Every slave device on the bus has a unique 7-bit address that allows the master to access that device. The DS7505’s 7-bit bus address where and through the corresponding input pins. The three address pins allow up to eight DS7505s to be mul- tidropped on the same bus ...
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... EEPROM-backed memory locations. The master sends a START followed by an address byte containing the DS7505 bus address. The R/W bit must The DS7505 responds with an ACK. If the next byte is a 0xB8, the DS7505 recalls all EEPROM data into shadow RAM locations. ...
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... Software POR [54h] The master sends a START followed by an address byte containing the DS7505 bus address. The R/W bit must 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 ...
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Digital Thermometer and Thermostat Package Information (For the latest package outline information www.maxim-ic.com/DallasPackInfo.) PACKAGE TYPE 8 SO (150 mils) 8 µMAX ______________________________________________________________________________________ DOCUMENT NO. 56-G2008-001 21-0036 13 ...
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... Maxim reserves the right to change the circuitry and specifications without notice at any time. 14 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2008 Maxim Integrated Products DESCRIPTION is a registered trademark of Maxim Integrated Products, Inc. Revision History PAGES CHANGED — ...