DS1825 Programmable Resolution 1-Wire Digital Thermometer With 4-Bit ID
3 of 21
AC ELECTRICAL CHARACTERISTICS: NV MEMORY
(-55癈 to +100癈; 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癈 to +55癈
50k
writes
EEPROM Data Retention
t
EEDR
-55癈 to +55癈
10
years
AC ELECTRICAL CHARACTERISTICS (-55?/SPAN>C to +125?/SPAN>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
祍
Time Slot
t
SLOT
60
120
祍
1
Recovery Time
t
REC
1
祍
1
Write 0 Low Time
t
LOW0
60
120
祍
1
Write 1 Low Time
t
LOW1
1
15
祍
1
Read Data Valid
t
RDV
15
祍
1
Reset Time High
t
RSTH
480
祍
1
Reset Time Low
t
RSTL
480
祍
1, 2
Presence Detect High
t
PDHIGH
15
60
祍
1
Presence Detect Low
t
PDLOW
60
240
祍
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
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