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ADT7485AARMZ-REEL7 Datasheet(PDF) 11 Page - Analog Devices |
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ADT7485AARMZ-REEL7 Datasheet(HTML) 11 Page - Analog Devices |
11 / 16 page ADT7485A Rev. 0 | Page 11 of 16 Command Code Details ADT7485A Device Identifier Block The GetDIB() command retrieves the device identifier block (DIB), which provides information to identify the capabilities of the ADT7485A. The data returned can be in 8- or 16-byte format. The full 16 bytes of DIB is detailed in Table 7. The 8-byte format involves the first eight bytes described in this table. Byte-sized data is returned in the respective fields as it appears in Table 7. Word-sized data, including vendor ID, device ID, and data values use little endian format, that is, the LSB is returned first, followed by the MSB. Table 7. 16-Byte DIB Details Byte Name Value Description 0 Device Capabilities 0xc0 Fixed address device 1 Version/Revision 0x10 Meets Version 1 of the SST specification 2, 3 Vendor ID 00x11d4 Contains company ID number in little endian format 4, 5 Device ID 0x7485 Contains device ID number in little endian format 6 Device Interface 0x01 SST device 7 Function Interface 0x00 Reserved 8 Reserved 0x00 Reserved 9 Reserved 0x00 Reserved 10 Reserved 0x00 Reserved 11 Reserved 0x00 Reserved 12 Reserved 0x00 Reserved 13 Reserved 0x00 Reserved 14 Revision ID 0x05 Contains revision ID 15 Client Device Address 0x48 to 0x4a Dependent on the state of the address pin Ping() The Ping() command verifies if a device is responding at a particular address. The ADT7485A shows a valid nonzero FCS in response to the Ping() command when correctly addressed. Table 8. Ping() Command Target Address Write Length Read Length FCS (Not necessary) 0x00 0x00 ResetDevice() This command resets the register map and conversion controller. The reset command can be global or directed at the client address of the ADT7485A. Table 9. ResetDevice() Command Target Address Write Length Read Length Reset command FCS Device Address 0x01 0x00 0xf6 GetIntTemp() The ADT7485A shows the local temperature of the device in response to the GetIntTemp() command. The data has a little endian, 16-bit, twos complement format. GetExtTemp() Prompted by the GetExtTemp() command, the ADT7485A shows the temperature of the remote diode in little endian, 16-bit, twos complement format. The ADT7485A shows 0x8000 in response to this command if the external diode is an open or short circuit. GetAllTemps() The ADT7485A shows the local and remote temperatures in a 4-byte block of data (internal temperature first, followed by external temperature) in response to a GetAllTemps() command. SetExtOffset() This command sets the offset that the ADT7485A will use to correct errors in the external diode. The offset is set in little endian, 16-bit, twos complement format. The maximum offset is ±128°C with +0.25°C resolution. GetExtOffset() This command causes the ADT7485A to show the offset that it is using to correct errors in the external diode. The offset value is returned in little endian format, that is, LSB before MSB. ADT7485A Response to Unsupported Commands A full list of command codes supported by the ADT7485A is given in Table 6. The offset registers (Command Code 0xe0) are the only registers that the user can write to. The other defined registers are read only. Writing to Register Addresses 0x02, 0x09, and 0x15 to 0xdf shows a valid FSC, but no action is taken by the ADT7485A. The ADT7485A shows an invalid FSC if the user attempts to write to the device between Command Codes 0xe2 to 0xee. These registers are reserved for the manufacturer’s use only, and no data can be written to the device via these addresses. |
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