sky130_od_ip__tempsensor

Temperature sensor design in sky130 technology. #chipalooza_challenge Based on design. New design in xschem/sky130_od_ip__tempsensor_ext_vp.sch with external V ref (from external bandgap).

Specifications

Parameter	Min	Typical	Max	Unit	Notes
Operating Temperature Range	-40	25	125	°C	Commercial/industrial
Temperature Accuracy	-2	±0.5	2	°C	At room temperature
Temparature Accuracy			5	°C	Across all corners
Temperature Resolution	0.06	0.1	0.5	°C
Power Consumption (enabled)		10	20	µA	At nominal conditions
Power Consumption (disabled)		5	10	nA	Current consumption when inactive
Response Time	5	10	20	ms	Time to reach 90% of the final temperature value
Supply Voltage Sensitivity		0.01	0.05	%/V
Linearity			1	%	Deviation from a straight line

Pinout

name	use
vdd	digital power	1.8v
vss	digital ground	0.0v
vbg	V bandgap	1.2v
ena	enable	1.8v domain
Vbe1	signal output	1.8v domain
Vbe2	signal output	1.8v domain

Currently:

• Vbe1 ~ 550mV-750mV
• ΔVbe=Vbe2-Vbe1 ~ 30mV-56mV
• α = 10.7906
• T = 714.015*μ-259.802 where μ = α/(α+Vbe1/ΔVbe)

Environment

export PDK_ROOT=/usr/local/share/pdk
export PDK=sky130A

Setup

cp $PDK_ROOT/sky130A/libs.tech/xschem/xschemrc .
cp $PDK_ROOT/sky130A/libs.tech/magic/sky130A.magicrc ./.magicrc
cp $PDK_ROOT/sky130A/libs.tech/ngspice/spinit  ~/.xschem/simulations/.spiceinit

optional

• Adding num_threads=8 to .spiceinit