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SS8018 데이터시트(PDF) 10 Page - Silicon Standard Corp. |
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SS8018 데이터시트(HTML) 10 Page - Silicon Standard Corp. |
10 / 14 page www.SiliconStandard.com 10 of 14 SS8018 Command Byte Functions The 8-bit command byte register (Table 5) is the master index that points to the various other registers within the SS8018. The register’s POR state is 0000 0000, so that a Receive Byte transmission (a protocol that lacks the command byte) that occurs immediately after POR re- turns the current local temperature data. The one-shot command immediately forces a new con- version cycle to begin. In software standby mode ( RUN /STOP bit = high), a new conversion is begun, after which the device returns to standby mode. If a conversion is in progress when a one-shot command is received in auto-convert mode ( RUN /STOP bit = low) between conversions, a new conversion begins, the conversion rate timer is reset, and the next automatic conversion takes place after a full delay elapses. Configuration Byte Functions The configuration byte register (Table 6) is used to mask interrupts and to put the device in software standby mode. The other bits are empty. Status Byte Functions The status byte register (Table 7) indicates which (if any) temperature thresholds have been exceeded. This byte also indicates whether or not the ADC is converting and whether there is an open circuit in the remote diode DXP-DXN path. After POR, the normal state of all the flag bits is zero, assuming none of the alarm conditions are present. The status byte is cleared by any success- ful read of the status, unless the fault persists. Note that the ALERT interrupt latch is not automatically cleared when the status flag bit is cleared. When reading the status byte, you must check for inter- nal bus collisions caused by asynchronous ADC timing, or else disable the ADC prior to reading the status byte (via the RUN /STOP bit in the configuration byte). In one-shot mode, read the status byte only after the con- version is complete, which is approximately 125ms max after the one-shot conversion is commanded. Table 5. Command-Byte Bit Assignments REGISTER COMMAND POR STATE FUNCTINON RLTS 00h 0000 0000* Read local temperature. It returns latest temperature RRTE 01h 0000 0000* Read remote temperature. It returns latest temperature RSL 02h N/A Read status byte (flags, busy signal) RCL 03h 0000 0000 Read configuration byte RCRA 04h 0000 1000 Read conversion rate byte RLHN 05h 0101 0101 (85) Read local THIGH limit RLLI 06h 0000 0000 Read local TLOW limit RRHI 07h 0101 0101 (85) Read remote THIGH limit RRLS 08h 0000 0000 Read remote TLOW limit WCA 09h N/A Write configuration byte WCRW 0Ah N/A Write conversion rate byte WLHO 0Bh N/A Write local THIGH limit WLLM 0Ch N/A Write local TLOW limit WRHA 0Dh N/A Write remote THIGH limit WRLN 0Eh N/A Write remote TLOW limit OSHT 0Fh N/A One-shot command (use send-byte format) RTEXT 10h 0 Remote temperature extended byte RTOFS 11h 0 Remote temperature offset high byte RTOFSEXT 12h 0 Remote temperature offset extended byte RLEXT 13h 0 Remote THIGH limit extended byte RHEXT 14h 0 Remote TLOW limit extended byte RTTHERM 19h 0101 0101 (85) Remote temperature THERM limit LTTHERM 20h 0101 0101 (85) Local temperature THERM limit THERMHYST 21h 0000 1010 (10) THERM hysteresis ALERTFQ 22h 0 ALERT fault queue code MFGIO FEh 0100 0111 Manufacturer ID DEVID FFh 0000 0001 Device ID *If the device is in standby mode at POR, both temperature registers read 0 °C. Rev.2.01 6/06/2003 |
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