ds1075 ETC-unknow, ds1075 Datasheet - Page 10

• Manufacturer Part Number: ds1075
• Description: Econoscillator/divider
• Manufacturer: ETC-unknow

Figure 12
TRANSACTION SEQUENCE
The sequence for accessing the DS1075 via the 1–Wire
port is as follows:
Figure 13
FUNCTION COMMANDS
Once the bus master has detected a presence, it can
issue one of the four function commands. All Function
Commands are eight bits long, and are written lsb first. A
list of these commands follows:
Write DIV Register [01H]
This command allows the bus master to write to the
DS1075’s DIV register.
Read DIV Register [A1H]
This command allows the bus master to read the
DS1075’s DIV register.
DS1075
101697 10/16
Initialization
Function Command
Transaction/Data
V
PULLUP MIN
V
V
PULLUP
V
IL MAX
IH MIN
IN/OUT
0V
OSCILLATE
(NO PULL–UP)
PROGRAM
(PULL–UP)
RESISTOR
MASTER
DS1075
‘RESET PULSE’
MASTER TX
V
CC
V
t
V
OH
RSTL
IH
+5V
t
por
t
R
480 s < t
480 s < t
15 s < t
60 s < t
t
t
por
PDH
PDH
PDL
RSTL
RSTH
+5V
< 240 s
< 60 s
DS1075 ‘PRESENCE PULSE’
INITIALIZATION
All transactions on the 1–Wire bus begin with an initial-
ization sequence. The initialization sequence consists
of a reset pulse transmitted by the bus master followed
by a presence pulse(s) transmitted by the DS1075. The
presence pulse lets the bus master know that the
DS1075 is present and is ready to operate.
Write MUX Register [02H]
This command allows the bus master to write to the
DS1075’s MUX register.
Read MUX Register [A2H]
This command allows the bus master to read the
DS1075’s MUX register.
TRANSACTION/DATA
Immediately following the Function Command, the nine
data bits are written to or read from the DS1075. This
data is written/read lsb first. The following diagrams
illustrate the timing. Once data transfer is complete a
< 960 s
< 960 s
t
PDL
t
RSTH
t
stab
FIRST MASTER
TX RESET PULSE