DS1990R-F5 Maxim Integrated Products, DS1990R-F5 Datasheet - Page 6

• Manufacturer Part Number: DS1990R-F5
• Description: Serial Number Registration
• Manufacturer: Maxim Integrated Products

Specifications of DS1990R-F5

• Lead Free Status / Rohs Status: No

Figure 5. ROM FUNCTIONS FLOW CHART
MATCH ROM [55h] / SKIP ROM [CCh]
The minimum set of 1-Wire ROM function commands includes a Match ROM and a Skip ROM command. Since the
DS1990R contains only the 64-bit ROM without any additional data fields, Match ROM and Skip ROM are not
applicable. The DS1990R will remain silent (inactive) upon receiving a ROM function command that it doesn't
support. This allows the DS1990R to coexist on a multidrop bus with other 1-Wire devices that do respond to Match
ROM or Skip ROM (example DS1990R and DS1994).
Bus Master TX ROM
Function Command
Serial Number
DS1990R TX
DS1990R TX
DS1990R TX
Family Code
Command ?
Read ROM
33h or 0Fh
CRC Byte
(6 Bytes)
(1 Byte)
Y
N
Presence Pulse
Bus Master TX
DS1990R TX
6 of 8
Reset Pulse
N
N
N
DS1990R
DS1990R
DS1990R TX Bit 0
DS1990R TX Bit 0
DS1990R TX Bit 1
DS1990R TX Bit 1
Master TX Bit 63
Master TX Bit 0
Master TX Bit 1
Search ROM
Command ?
Match ?
Match ?
Match ?
Bit 63
Bit 0
Bit 1
F0h
TX Bit 63
TX Bit 63
Y
Y
Y
Y
N