U3741BM-M2FL Atmel, U3741BM-M2FL Datasheet - Page 21

• Manufacturer Part Number: U3741BM-M2FL
• Manufacturer: Atmel

Specifications of U3741BM-M2FL

• Operating Frequency (max): 450000kHz
• Operating Temperature (min): -40C
• Operating Temperature (max): 105C
• Operating Temperature Classification: Industrial
• Operating Supply Voltage (min): 4.5V
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (max): 5.5V
• Lead Free Status / Rohs Status: Not Compliant

Figure 19. Generation of the Power-on Reset
Figure 20. Timing of the Register Programming
Programming the
Configuration Register
4662B–RKE–10/04
Out1
(microcontroller)
DATA (U3741BM)
DATA (U3741BM)
data line
POR
Serial bi-directional
V
S
Receiver
on
X
X
X
t1
•
•
By means of that mechanism, the receiver cannot lose its register information without
communicating that condition via the reset marker RM.
The configuration registers are programmed serially via the bi-directional data line
according to Figure 20 and Figure 21.
Figure 21. One-wire Connection to a Microcontroller
t
Rst
f
cannot be misinterpreted by the connected microcontroller.
If the receiver is set back to polling mode via pin DATA, RM cannot be canceled by
accident if t1 is applied according to the proposal in the section “Programming the
Configuration Register” on page 21.
RM
t2
is lower than the lowest feasible frequency of a data signal. By this means, RM
t3
(Start bit)
t4
Bit 1
("0")
t6
t7
t5
DATA (U3741BM)
V
ThReset
U3741BM
(Register select)
Internal pull-up
Bit 2
("1")
resistor
Programming Frame
DATA
Bi-directional
data line
(Poll8)
Bit 13
("0")
I/O
1/f
RM
microcontroller
(Poll8R)
Bit 14
("1")
Out 1 (µC)
t8
t9
U3741BM
T
Sleep
Startup
mode
X
X
21