Datasheet

DS1825 Programmable Resolution 1-Wire Digital Thermometer With 4-Bit ID
3 of 21
AC ELECTRICAL CHARACTERISTICS: NV MEMORY
(-55°C to +100°C; V
DD
= 3.0V to 3.7V)
PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS
NV 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
AC ELECTRICAL CHARACTERISTICS (-55°C to +125°C; V
DD
= 3.0V to 3.7V)
PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS NOTES
9-bit resolution 93.75 ms 1
10-bit resolution 187.5 ms 1
11-bit resolution 375 ms 1
Temperature Conversion
Time
t
CONV
12-bit resolution 750 ms 1
Time to Strong Pullup On t
SPON
Start Convert T
Command Issued
10 µs
Time Slot t
SLOT
60 120 µs 1
Recovery Time t
REC
1 µs 1
Write 0 Low Time t
LOW0
60 120 µs 1
Write 1 Low Time t
LOW1
1 15 µs 1
Read Data Valid t
RDV
15 µs 1
Reset Time High t
RSTH
480 µs 1
Reset Time Low t
RSTL
480 µs 1, 2
Presence Detect High t
PDHIGH
15 60 µs 1
Presence Detect Low t
PDLOW
60 240 µs 1
Capacitance: DQ C
IN/OUT
25 pF
Capacitance: AD0-AD3 C
IN_AD
50 pF
NOTES:
1. Refer to timing diagrams in Figure 18.
2. Under parasite power, if t
RSTL
> 960ms, a power on reset may occur.
Table 1. DETAILED PIN DESCRIPTIONS
PIN SYMBOL DESCRIPTION
4 GND
Ground.
2
DQ
Data Input/Output pin. Open-drain 1-Wire interface pin. Also
provides power to the device when used in parasite power mode
(see Parasite Power section.)
1
V
DD
Optional V
DD
pin. V
DD
must be grounded for operation in parasite
power mode.
5 AD0
Location Address Input Pin LSB
6 AD1
Location Address Input Pin
7 AD2
Location Address Input Pin
8 AD3
Location Address Input Pin MSB
3 N.C.
No Connection