DS1985-F5+ Maxim Integrated Products, DS1985-F5+ Datasheet - Page 20
DS1985-F5+
Manufacturer Part Number
DS1985-F5+
Description
IBUTTON 16KBit ADD-ONLY F5
Manufacturer
Maxim Integrated Products
Series
iButton®r
Datasheet
1.DS1985-F5.pdf
(26 pages)
Specifications of DS1985-F5+
Rohs Information
IButton RoHS Compliance Plan
Memory Size
2KB
Memory Type
EPROM
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
(Figure 11) should be applied for 480 s, after which the bus master returns the data line to an idle high
state controlled by the pullup resistor. Note that due to the high voltage programming requirements for
any 1-Wire EPROM device, it is not possible to multidrop non-EPROM based 1-Wire devices with the
DS1985 during programming. An internal diode within the non-EPROM based 1-Wire devices will
attempt to clamp the data line at approximately 8 volts and could potentially damage these devices.
INITIALIZATION PROCEDURE “RESET AND PRESENCE PULSES” Figure 9
In order not to mask interrupt signaling by other devices on the 1-Wire bus, t
READ/WRITE TIMING DIAGRAM Figure 10
Write-1 Time Slot
be less than 960 s.
RESISTOR
MASTER
DS1985
RESISTOR
MASTER
480 s t
480 s t
15 s t
60 s t
60 s t
1 s t
1 s t
LOW1
REC
PDH
PDL
SLOT
RSTL
RSTH
<
20 of 26
< 240 s
< 60 s
< 15 s
< 120 s
< *
< (includes recovery time)
RSTL
+ t
R
should always