DS1920 Maxim, DS1920 Datasheet - Page 20

• Manufacturer Part Number: DS1920
• Description: The DS1920 provides direct-to-digital 9-bit temperature readings over a range of -55°C to +100°C in 0
• Manufacturer: Maxim

AC ELECTRICAL CHARACTERISTICS: 1-Wire INTERFACE
(V
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 200µA.
6. t
7. The reset low time should be restricted to a maximum of 960µs, 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 800pF when power is first applied. If a 5kΩ resistor is used
10. Under certain low-voltage conditions, V
11. See the Typical Performance Curve for specification limits outside the 0°C to +70°C range.
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
PUP
otherwise it could mask or conceal interrupt pulses.
guaranteed to be valid within 1µs of this falling edge and will remain valid for 14µs minimum (15µs
total from falling edge on 1-Wire bus).
to pull up the data line to V
affect normal communications.
guarantee a presence pulse.
Thermometer error reflects sensor accuracy as tested during calibration.
RSTL
DD
= 2.8V to 6.0V, T
PARAMETER
specified with low-impedance pullup to 5.0V.
may be up to 4800µs. With longer times, the result of temperature conversion may get lost.
A
= -55°C to +100°C.)
SYMBOL
t
t
t
RELEASE
CC
PDHIGH
t
t
t
t
PDLOW
t
t
t
LOW1
LOW0
RSTH
SLOT
RSTL
RDV
t
REC
SU
, 5µs after power has been applied, the parasite capacitance will not
ILMAX
MIN
480
480
60
60
15
60
1
0
1
20 of 22
may have to be reduced to as much as 0.5V to always
TYP
exactly 15
15
MAX
4800
120
120
240
15
45
60
1
PUP
= 3.4V.
UNITS
µs
µs
µs
µs
µs
µs
µs
µs
µs
µs
µs
NOTES
6, 7
8
DS1920