NE1617A All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved.
Product data sheet Rev. 5 — 20 March 2012 18 of 30
NXP Semiconductors
NE1617A
Temperature monitor for microprocessor systems
11. Characteristics
[1] The value of V
DD
below which the internal A/D converter is disabled. This is designed to be a minimum of 200 mV above the power-on
reset. During the time that it is disabled, the temperature that is in the ‘read temperature registers’ will remain at the value that it was
before the ADC was disabled. This is done to eliminate the possibility of reading unexpected false temperatures due to the A/D
converter not working correctly due to low voltage. In case of power-up (rising V
DD
), the reading that is stored in the ‘read temperature
registers’ will be the default value of 0 C. As soon as V
DD
has risen to the value of UVLO, the ADC will function correctly and normal
temperatures will be read.
[2] V
DD
(rising edge) voltage below which the ADC is disabled.
[3] V
DD
(falling edge) voltage below which the logic is reset.
[4] Address is read at power-up and at start of conversion for all conversions except the fastest rate.
[5] Due to the bias current, any pull-up/pull-down resistors should be 2k.
Table 13. Characteristics
V
DD
= 3.0 V to 3.6 V; T
amb
=0
C to +125
C; unless otherwise specified.
Symbol Parameter Conditions Min Typ Max Unit
T
res
temperature resolution 1 - - C
T
acc(loc)
local temperature accuracy T
amb
=+60C to +100 C-<1 2 C
T
amb
=0C to +125 C-<2 3 C
T
acc(rem)
remote temperature accuracy T
remote
=+60C to +100 C--3 C
T
remote
= 40 C to +125 C--5 C
V
th(UVLO)
undervoltage lockout threshold
voltage
[1]
V
DD
supply
[2]
- 2.7 2.95 V
V
th(POR)
power-on reset threshold
voltage
V
DD
supply (falling edge)
[3]
1.0 - 2.5 V
I
DD(AV)
average supply current conversion rate = 0.25 per second - - 70 A
conversion rate = 2 per second - - 180 A
I
DD(stb)
standby supply current SMBus inactive - 3 10 A
t
conv
conversion time from STOP bit to conversion
complete; both channels
--170ms
E
f(conv)
conversion rate error percentage error in programmed
rate
30 - +30 %
I
source
source current remote sensor
HIGH level - 100 - A
LOW level - 10 - A
I
bias
bias current ADD0, ADD1; momentary as the
address is being read
[4][5]
- 160 - A
