Datasheet

(V
PU
=3.0Vto3.7V,T
A
=-55°Cto+100°C,unlessotherwisenoted.)(Note1)
Note 1: Limitsare100%testedatT
A
= +25°C and T
A
=+85°C.Limitsovertheoperatingtemperaturerangeandrelevantsupply
voltage are guaranteed by design and characterization.
Note 2: All voltages are referenced to ground.
Note 3: The pullup supply voltage specification assumes that the pullup device (resistor or transistor) is ideal, and therefore the
highlevelofthepullupisequaltoV
PU
.Inordertomeetthedevice’sV
IH
spec, the actual supply rail for the strong pullup
transistormustincludemarginforthevoltagedropacrossthetransistorwhenitisturnedon;thus:V
PU_ACTUAL
=V
PU_
IDEAL
+V
TRANSISTOR
.
Note 4: Logic-lowvoltagesarespecifiedatasinkcurrentof4mA.
Note 5: Toguaranteeapresencepulseunderlow-voltageparasite-powerconditions,V
ILMAX
may have to be reduced to as low as
0.5V.
Note 6: Logic-highvoltagesarespecifiedatasourcecurrentof1mA.
Note 7: Active current refers to supply current during active temperature conversions or EEPROM writes.
Note 8: DQlineishigh(high-Zstate).
Note 9: Driftdataisbasedona1000-hourstresstestat+125°C.
Note 10: Seethe1-Wire Timing Diagrams.
Note 11: If t
RSTL
> 960µs, a power-on reset may occur.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Temperature Conversion Time t
CONV
9-bit resolution 93.75
ms
10-bit resolution 187.5
11-bit resolution 375
12-bit resolution 750
TimetoStrongPullupOn t
SPON
StartConvertTcommandorCopy
Scratchpadcommandissued
10 µs
TimeSlot t
SLOT
(Note10) 60 120 µs
Recovery Time t
REC
(Note10) 1 µs
Write-ZeroLowTime t
LOW0
(Note10) 60 120 µs
Write-OneLowTime t
LOW1
(Note10) 1 15 µs
ReadDataValid t
RDV
(Note10) 15 µs
ResetTimeHigh t
RSTH
(Note10) 480 µs
ResetTimeLow t
RSTL
(Notes10,11) 480 960 µs
Presence-DetectHigh t
PDHIGH
(Note10) 15 60 µs
Presence-DetectLow t
PDLOW
(Note10) 60 240 µs
Capacitance C
IN/OUT
25 pF
NONVOLATILE MEMORY
NonvolatileWriteCycleTime t
WR
2 10 ms
EEPROM Writes N
EEWR
-55°C to +55°C 50k Writes
EEPROMDataRetention t
EEDR
-55°C to +55°C 10 Years
MAX31820PAR 1-Wire, Parasite-Power,
Ambient Temperature Sensor
www.maximintegrated.com
Maxim Integrated │ 3
AC Electrical Characteristics