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MAX6604AHA Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX6604AHA Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 16 page the critical temperature register is likely to be higher than that of the alarm-upper-boundary register. As a result, when the temperature is above the critical temperature, it is likely that it is above the alarm-upper-boundary as well. In interrupt mode, EVENT asserts when the temper- ature crosses the alarm upper boundary. If the EVENT output is cleared and the temperature continues to increase until it crosses the critical temper- ature threshold, EVENT asserts again. Because the temperature is greater than the critical temperature threshold, a clear event command does not clear the EVENT output. Once the temperature drops below the critical temperature, EVENT deasserts immediately. If the EVENT output is not cleared before the tempera- ture goes above the critical temperature threshold, EVENT remains asserted. Attempting a clear event command has no effect until the temperature drops below the critical temperature, at which point EVENT deasserts immediately because of the earlier clear event command. If no clear event command is attempt- ed, EVENT remains asserted after the temperature drops below the critical temperature. At this point, a clear event command deasserts EVENT. Detailed Register Descriptions Capability Register (Read Only) [Address = 00h, POR = 0017h] This register indicates the capabilities of the thermal sensor, including accuracy, temperature range, and resolution. See Table 3 for register details. Configuration Register (Read/Write) [Address = 01h, POR = 0000h] This register controls the various features of EVENT functionality, and controls the bit for thermal-sensor shutdown mode. See Table 4 for register details. Hysteresis When enabled, hysteresis is applied to temperature varia- tions around trigger points. For example, consider the behavior of the alarm window bit (bit 14 of the tempera- ture register) when the hysteresis is set to 3°C. As the temperature rises, bit 14 is set to 1 (temperature is above the alarm window) when the temperature register con- tains a value that is greater than the value in the alarm temperature upper boundary register. If the temperature decreases, bit 14 remains set until the measured temper- ature is less than or equal to the value in the alarm tem- perature upper boundary register minus 3°C. Precision Temperature Monitor for DDR Memory Modules 8 _______________________________________________________________________________________ Table 3. Capability Register (Read Only) Bit 15 Bit 14 Bit 13 Bit 12 Bit 11 Bit 10 Bit 9 Bit 8 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 BIT DEFINITION (DESCRIPTIONS IN BOLD TYPE APPLY TO THE MAX6604) 0 Basic capability 1: Has alarm and critical trips capability 1 Accuracy 0 = Default accuracy ±2°C over the active and ±3°C monitor ranges 1 = High accuracy ±1°C over the active and ±2°C monitor ranges 2 Wider range 0 = Values lower than 0°C are clamped and represented as binary value 0 1 = Can read temperature below 0°C and set sign bit accordingly 4:3 Temperature resolution 00 = 0.5°C LSB 01 = 0.25°C LSB 10 = 0.125°C LSB 11 = 0.0625°C LSB 15:5 0: Reserved for future use (RFU). Must be zero. |
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