DS1920-F3 Maxim Integrated Products, DS1920-F3 Datasheet - Page 21

• Manufacturer Part Number: DS1920-F3
• Description: Temperature Ibutton
• Manufacturer: Maxim Integrated Products

AC ELECTRICAL CHARACTERISTICS:
1-WIRE INTERFACE
NOTES:
1. Temperature conversion will work with ±2°C accuracy down to V
2. All voltages are referenced to ground.
3. I
4. Active current refers to temperature conversion.
5. Writing to EEPROM consumes approximately 200 A.
6. t
7. The reset low time should be restricted to a maximum of 960 ms, to allow interrupt signaling,
8. Read data setup time refers to the time the host must pull the 1-Wire bus low to read a bit. Data is
9. Capacitance on the data contact could be 800 pF when power is first applied. If a 5k
10. Under certain low voltage conditions V
11. See Typical Curve for specification limits outside the 0°C to 70°C range. Thermometer error reflects
Time Slot
Write 1 Low Time
Write 0 Low Time
Read Data Valid
Release Time
Read Data Setup
Recovery Time
Reset Time High
Reset Time Low
Presence Detect High
Presence Detect Low
otherwise it could mask or conceal interrupt pulses.
guaranteed to be valid within 1 s of this falling edge and will remain valid for 14 s minimum. (15
to pull up the data line to V
affect normal communications.
guarantee a presence pulse.
sensor accuracy as tested during calibration.
RSTL
DD
s total from falling edge on 1-Wire bus.)
PARAMETER
specified with low impedance pull up to 5.0V.
may be up to 4800 s. With longer times, the result of temperature conversion may get lost.
SYMBOL
t
CC
t
RELEASE
t
PDHIGH
t
t
PDLOW
t
t
t
t
t
LOW1
LOW0
RSTH
SLOT
RSTL
RDV
t
REC
SU
, 5 s after power has been applied, the parasite capacitance will not
ILMAX
MIN
480
480
60
60
15
60
1
0
1
21 of 22
may have to be reduced to as much as 0.5V to always
TYP
exactly 15
15
(-55°C to +100°C; V
MAX
4800
120
120
240
15
45
60
1
PUP
= 3.4V.
UNITS
PUP
s
s
s
s
s
s
s
s
s
s
s
=2.8V to 6.0V)
resistor is used
NOTES
6,7
8
DS1920