Add overtemp protection to the P0V85 circuit
Hi,
While stress-testing the Zynq power consumption, our students discovered that TDA21240 is getting quite hot:
The problem is that this chip doesn't have the thermal fault output connected, so there's a risk of it overheating without anyone noticing this. This chip doesn't have automatic shutdown, so this output really should be connected.
Moreover, the LM75 measurement for the power section is much lower:
lm75a-i2c-5-4a
Adapter: i2c-1-mux (chan_id 1)
Temp Power Management: +53.0 C (high = +80.0 C, hyst = +75.0 C)
Maybe its placement could be optimized?
The measurements were taken with PL power consumption reaching the max load:
IRPS1 Input Power: 36.50 W
pin2: 2.16 W
pin3: 406.25 mW
pin4: 718.75 mW
pin5: 62.50 mW
IRPS1 P0V85 Power: 32.25 W
IRPS1 P1V8_AUX Power: 2.00 W
IRPS1 P1V2 Power: 437.50 mW
IRPS1 P1V8 Power: 812.50 mW
IRPS1 P1V2_PSPLL LDO Power: 31.25 mW
IRPS1 Input Current: 2.94 A
iin2: 171.00 mA
iin3: 31.00 mA
iin4: 54.00 mA
IRPS1 P0V85 Current: 38.25 A (max = +36.00 A, crit max = +39.00 A) ALARM (MAX)
IRPS1 P1V8_AUX Current: 1.12 A (max = +2.41 A, crit max = +2.59 A)
IRPS1 P1V2 Current: 375.00 mA (max = +4.81 A, crit max = +5.19 A)
IRPS1 P1V8 Current: 453.00 mA (max = +4.81 A, crit max = +5.19 A)
IRPS1 P1V2_PSPLL LDO Current: 30.00 mA (max = +0.65 A, crit max = +0.72 A)