11.1.8.12 Temperature Sensor and Voltage Reference Characteristics

The temperature sensor provides two output voltages that can be converted by the internal 12-bit ADC:

V_TEMP: proportional to the junction temperature (T_J), and
V_BG: temperature-independent voltage.

Both voltages are multiplexed to ADC channel 31. The selection of V_TEMP or V_BG is done with the ADC_ACR.SRCLCH bit. Calibration data for the temperature sensor are factory-programmed in one OTP controller packet. These calibration data can only be read and used after writing a “Boot Configuration Packet” in the OTP memory. Refer to the application note “SAMA7G5 Series Temperature Sensor Calibration” (AN4530), available on microchip.com.

Table 11-60. Temperature Sensor Characteristics
Symbol	Parameter	Conditions	Min	Max	Unit
V_DDIN33	Supply voltage range (VDDIN33)⁽¹⁾	–	3.0	3.6	V
I_VDDIN33	Current consumption⁽²⁾	–	–	200	µA
t_START	Start-up time⁽²⁾	–	–	20	μs
V_TEMP	Temperature output voltage	T_J = 25°C	0.59	0.67	V
dV_TEMP/dT	V_TEMP sensitivity to temperature⁽²⁾	–	2.08		mV/°C
T_ACC	Temperature reading accuracy⁽²⁾⁽³⁾	Over the applicable T_J range	–	±5	°C
V_BG0	VBG reference output voltage	T_J = 27°C	1.19	1.21	V
ΔV_BG	VBG drift with temperature⁽²⁾	ΔV_BG = V_BG(T_J)-V_BG0	-20	20	mV
t_TH	V_TEMP or V_BG track-and-hold time⁽²⁾	Required track-and-hold time to ensure 1 LSB accurate settling on internal 12-bit ADC	1	–	µs

Note:

The temperature sensor is powered by the VDDOUT25 regulator, which is supplied from VDDIN33.
Simulation data
Using the temperature sensor calibration procedure described in the application note “SAMA7G5 Series Temperature Sensor Calibration” (AN4530), available on microchip.com.