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SNLS779A July 2025 – November 2025 DP83TC815-Q1

PRODUCTION DATA

封裝選項

機械數據 (封裝 | 引腳)

RHA|36
- MPQF611A

散熱焊盤機械數據 (封裝 | 引腳)

RHA|36
- QFND711

訂購信息

7.3.6.5 Temperature Sensing

Temperature Sensing Steps Summary

The DP83TC815-Q1 offers sensors for monitoring temperature at the supply pins. Over temperature monitoring is always active in the DP83TC815-Q1 by default. If an over temperature condition is detected, interrupt status flag is set in register 0x0013. These interrupts can also be optionally routed to the INT pin using the same register.

Step 1: Program register 0x469=0x8324; Initial configuration of monitor.
Step 2: Program registers 0x046A = 0x0096, 0x046A = 0x0093; Enable Monitors
Step 3: Configure over temperature interrupt settings. See the Interrupt Overtemperature Thresholds section for more details. (optional)
Step 4: Program register 0x0013=0x008; Enable over temperature interrupt (optional)
Step 5: Set register 0x468=0x4920 to select the temperature sensor.
Step 6: Read register 0x047B[14:7] and convert this output code to decimal.

Step 7: Use the output code in the following equation to get the absolute value of the sensor:

temp_value = 25 + (temp_output_code – temp_output_mean_code) × slope_temp_sensor

Table 7-21 Temperature Sensors Constant Values

SENSOR	CONSTANT	VALUE
Temperature	temp_output_mean_code	90
Temperature	slope_temp_sensor	1.0839

To detect over temperature use the interrupt register, continuously read 0x13[11].
Pin 2 can also be configured as an interrupt pin through register 0x11. When configured correctly, pin 2 is asserted LOW when the over temperature condition occurs.0x13[11].

Over Temperature Threshold Register

The over temperature threshold register has two fields, over_up_th and over_low_th. When the monitor read value goes above over_up_th, the interrupt is asserted high. After the interrupt is asserted high, the interrupt is asserted low only if the monitor read value goes below over_low_th .

Table 7-22 Over Temperature Register Thresholds

MONITOR	over_up_th	over_low_th
Temperature	0x0473<7:0>	0x0473<15:8>

Example of How to Configure Over Temperature Threhsholds

Step 1: Decide over_up_th and over_low_th temperatures.
over_up temperature: 130°C
over_low temperature: 140°C
Step 2: Subsitute the temperature values into the equation and solve for temp_output_code.
- temp_value = 25 + (temp_output_code – temp_output_mean_code) × slope_temp_sensor
- 130^oC = 25 + (temp_output_code_130 – 81.26 ) × 1.0839
- 140^oC = 25 + (temp_output_code _140 – 81.26 ) × 1.0839
- temp_output_code_130 = 187
- temp_output_code_140 = 178
Step 3: Set the register bits over_up_th to 187 and over_low_th to 178.

Note: The DP83TC815-Q1 does not inlude a hardware calibration. Accuracy of the temperature sensor is about ±25°C for a part and ±11°C across parts.