U3741BM-M2FLG3 TEMIC [TEMIC Semiconductors], U3741BM-M2FLG3 Datasheet - Page 16

• Manufacturer Part Number: U3741BM-M2FLG3
• Description: UHF ASK/FSK Receiver
• Manufacturer: TEMIC [TEMIC Semiconductors]

Table 10.Effect of the configuration word Lim_max
Conservation of the Register Information
The U3741BM implies an integrated power-on reset and
brown–out detection circuitry to provide a mechanism to
preserve the RAM register information.
According to figure 21, a power-on reset (POR) is
generated if the supply voltage V
threshold voltage V
programmed into the configuration registers in that
condition. Once V
after the minimum reset period t
generated when 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
V
POR
DATA (U3741BM)
U3741BM
16 (25)
S
0
0
0
0
1
1
1
.
.
.
.
.
.
0
0
0
1
1
1
1
.
.
.
.
.
.
X
S
Lim_max < 12 is not applicable
exceeds V
ThReset
. The default parameters are
Lim_max
1
1
1
1
1
1
1
.
.
.
.
.
.
ThReset
t
Rst
Rst
S
Preliminary Information
the POR is canceled
. A POR is also
Figure 21. Generation of the power on reset
1
1
1
0
1
1
1
.
.
.
.
.
.
drops below the
0
0
1
0
0
1
1
.
.
.
.
.
.
V
ThReset
0
1
0
0
1
0
1
.
.
.
.
.
.
represented by the fixed frequency f
cycle. RM can be canceled via an ‘L’ pulse t1 at Pin
DATA. The RM implies the following characteristics:
D
D
By means of that mechanism the receiver cannot lose its
register information without communicating that condi-
tion via the reset marker RM.
f
data signal. By this means, RM cannot be misinter-
preted by the connected C.
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 registers’.
RM
(USA: T
is lower than the lowest feasible frequency of a
(T
Lim_max
Lim_max
Upper Limit Value for Bitcheck
= (Lim_max –1)
= 375 s, Europe: T
24 (Default)
1 / f
RM
12
13
14
61
62
63
Rev. A1, 15-Oct-98
RM
XLim
Lim_max
at a 50% duty
T
= 381 s)
Clk
)