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SA56004X Datasheet(PDF) 11 Page - NXP Semiconductors |
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SA56004X Datasheet(HTML) 11 Page - NXP Semiconductors |
11 / 23 page Philips Semiconductors Product data sheet SA56004X ±1 °C accurate, SMBus-compatible, 8-pin, remote/local digital temperature sensor with over temperature alarms 2004 Oct 06 11 Power-on-reset (POR) When power is applied to the SA56004X, the device will enter into its power-on-reset state and its registers are reset to their default values. The configuration, status, and temperature-reading registers remain in these states until after the first conversion. As shown in Table 2, this results in: 1. Command register set to 00h. 2. Local Temperature register (LTHB and LTLB) set to 0 °C. 3. Remote Diode Temperature register (RTHB and RTLB) set to 0 °C until the end of the first conversion. 4. Status register (SR) set to 00h. 5. Configuration register (CON) set to 00h; Interrupt latches are cleared, the ALERT and T_CRIT output drivers are off and the ALERT and T_CRIT pins are pulled HIGH by the external pull-up resistors. 6. Local T_CRIT temperature setpoints (LCS) and Remote T_CRIT temperature setpoints (RCS) at 85 °C. 7. Local HIGH setpoint (LHS) and remote HIGH temperature setpoint (RHSHB) at 70 °C. 8. Local LOW setpoint (LLS) and Remote LOW temperature setpoints (RLSHB) at 0 °C. 9. Conversion Rate register (CR) is set to 8h; the default value of about 16 conversions/s. Starting conversion Upon POR, the RUN/STOP bit 6 of the configuration register is zero (default condition), then, the device will enter into its free-running operation mode in which the device A/D converter is enabled and the measurement function is activated. In this mode, the device cycles the measurements of the local and remote temperature automatically and periodically. The conversion rate is defined by the programmable conversion rate stored in the conversion rate register. It also performs comparison between readings and limits of the temperature in order to set the flags and interruption accordingly at the end of every conversion. Measured values are stored in the temp registers, results of the limit comparisons are reflected by the status of the flag bits in the status register and the interruption is reflected by the logical level of the ALERT and T_CRIT output. If the power-on temperature limit is not suitable, the temp limit values could be written into the limit registers during the busy-conversion duration of about 38 ms of the first conversion after power-up. Otherwise, the status register must be read and the configuration bit 7 must be reset in order to recover the device from interruption caused by the undesired temp limits. Low power software standby mode The device can be placed in a software standby mode by setting the RUN/STOP bit 6 in the configuration register HIGH (to 1). In standby, the free-running oscillator is stopped, the supply current is less than 10 µA if there is no SMBus activity, all data in the registers is retained. However, the SMBus is still active and reading and writing registers can still be performed. A one-shot command will initiate a single conversion which has the same effect as any conversion that occurs when the device is in its free-running mode. To restore the device to free running mode, set the RUN/STOP bit 6 LOW (to 0). Temperature data format The temperature data can only be read from the Local and Remote Temperature registers; the setpoint registers (e.g. T_CRIT, LOW, HIGH) are read/write. Both local and remote temperature reading data is represented by an 11-bit, 2’s complement word with the LSB (Least Significant Bit) = 0.125 °C. The temperature setpoint data for the remote channel is also represented by an 11-bit, 2’s complement word with the LSB = 0.125 °C. The temperature setpoint data for both the local channel and the T_CRIT setpoints are represented by 8-bit, 2’s complement words with the LSB = 1.0 °C. For 11-bit temp data, the data format is a left justified, 16-bit word available in two 8-bit registers (high byte and low byte). For 8-bit temp data, the data is available in a single 8-bit register (high byte only). Table 3. Temperature data format TEMPERATURE DIGITAL OUTPUT BINARY HEX +125 °C 0111 1101 0000 0000 7D00h +25 °C 0001 1001 0000 0000 1900h +1 °C 0000 0001 0000 0000 0100h +0.125 °C 0000 0000 0010 0000 0020h 0 °C 0000 0000 0000 0000 0000h –0.125 °C 1111 1111 1110 0000 FFE0h –1 °C 1111 1111 0000 0000 FF00h –25 °C 1110 0111 0000 0000 E700h –55 °C 1100 1001 0000 0000 C900h |
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