U3741BM-P2FL Atmel, U3741BM-P2FL Datasheet - Page 20

• Manufacturer Part Number: U3741BM-P2FL
• Description: IC RECEIVER PLL 300KHZ 20-SOIC
• Manufacturer: Atmel

Specifications of U3741BM-P2FL

• Frequency: 300MHz ~ 450MHz
• Sensitivity: -109dBm
• Data Rate - Maximum: 10 kBaud
• Modulation Or Protocol: ASK, FSK
• Applications: RKE, Remote Control Systems
• Current - Receiving: 8.2mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 105°C
• Package / Case: 20-SOIC (0.300", 7.50mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Features: -
• Memory Size: -

Table 9. Effect of the Configuration Word Lim_min
Table 10. Effect of the Configuration Word Lim_max
Conservation of the Register
Information
20
0
0
0
0
0
1
1
1
0
0
0
0
1
1
1
.
.
.
.
.
.
.
.
.
U3741BM
0
0
0
0
0
1
1
1
Lim_max < 12 is not applicable
0
0
0
1
1
1
1
Lim_min < 10 is not applicable
.
.
.
.
.
.
.
.
.
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
.
.
.
.
.
.
.
.
.
Lim_max
Lim_min
0
0
1
1
1
1
1
1
.
.
.
1
1
1
0
1
1
1
.
.
.
.
.
.
The U3741BM has an integrated power-on reset and brown-out detection circuitry to
provide a mechanism to preserve the RAM register information.
According to Figure 19 on page 21, a power-on reset (POR) is generated if the supply
voltage V
grammed into the configuration registers in that condition. Once V
the POR is canceled after the minimum reset period t
the supply voltage of the receiver is turned on.
To indicate that condition, the receiver displays a reset marker (RM) at pin DATA after a
reset. The RM is represented by the fixed frequency f
canceled via an ‘L’ pulse t1 at pin DATA. The RM implies the following characteristics:
1
1
0
0
1
0
1
1
.
.
.
0
0
1
0
0
1
1
.
.
.
.
.
.
S
drops below the threshold voltage V
0
1
0
1
0
1
0
1
0
1
0
0
1
0
1
.
.
.
.
.
.
.
.
.
(USA: T
(USA: T
(T
Lim_max
(T
Lim_max
Lim_min
Lower Limit Value for Bit Check
Upper Limit Value for Bit Check
Lim_min
= (Lim_max - 1)
= 228 µs, Europe: T
= 375 µs, Europe: T
= Lim_min
ThReset
14 (Default)
24 (Default)
RM
Rst
10
11
12
13
61
62
63
12
13
14
61
62
63
. The default parameters are pro-
. A POR is also generated when
at a 50% duty cycle. RM can be
XLim
XLim
Lim_min
Lim_max
T
S
Clk
= 232 µs)
T
= 381 µs)
exceeds V
)
Clk
)
4662B–RKE–10/04
ThReset
,