SMBus-Compatible, 8-Pin, Remote/Local Digital Temperature Sensor

SA56004X

The NXP Semiconductors SA56004X is an SMBus compatible, 11-bit remote/local digital temperature sensor with over-temperature alarms. The remote channel of the SA56004X monitors a diode junction, such as a substrate PNP of a microprocessor or a diode connected transistor such as the 2N3904 (NPN) or 2N3906 (PNP). With factory trimming, remote sensor accuracy of ±1 °C is achieved.

Under-temperature and over-temperature alert thresholds can be programmed to cause the ALERT output to indicate when the on-chip or remote temperature is out of range. This output may be used as a system interrupt or SMBus alert. The T_CRIT output is activated when the on-chip or remote temperature measurement rises above the programmed T_CRIT threshold register value. This output may be used to activate a cooling fan, send a warning or trigger a system shutdown. To further enhance system reliability, the SA56004X employs an SMBus time-out protocol. The SA56004X has a advanced device architecture.

The SA56004X is available in the SO8, TSSOP8 and HVSON8 packages. SA56004X has 8 factory-programmed device address options. The SA56004X is pin-compatible with the LM86, MAX6657/8, and ADM1032.

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SA56004X Block Diagram

SA56004X Block Diagram

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Features

  • Accurately senses temperature of remote microprocessor thermal diodes or diode connected transistors within ±1 °C
  • On-chip local temperature sensing within ±2 °C
  • Temperature range of −40 °C to +125 °C
  • 11-bit, 0.125 °C resolution
  • 8 different device addresses are available for server applications. The SA56004ED with marking code 56004E, and SA56004EDP with marking code 6004E are address compatible with the National LM86, the MAX6657/8 and the ADM1032
  • Offset registers available for adjusting the remote temperature accuracy
  • Programmable under/overtemperature alarms: ALERT and T_CRIT
  • SMBus 2.0 compatible interface, supports TIMEOUT
  • Operating voltage range: 3.0 V to 3.6 V
  • I²C-bus Standard-mode and Fast-mode compatible
  • SO8, TSSOP8 and HVSON8 packages
  • Programmable conversion rate (0.0625 Hz to 26 Hz)
  • Undervoltage lockout prevents erroneous temperature readings
  • Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA

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