U3741BM Datasheet, PDF (20/32 Pages) ATMEL Corporation – UHF ASK RECEIVER IC

Table 9. Effect of the Configuration Word Lim_min
Lim_min
Lim_min < 10 is not applicable
0
0
1
0
1
0
0
0
1
0
1
1
0
0
1
1
0
0
0
0
1
1
0
1
0
0
1
1
1
0
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
1
1
1
1
0
1
1
1
1
1
1
0
1
1
1
1
1
1
Lower Limit Value for Bit Check
(T_{Lim_min} = Lim_min × XLim × T_Clk)
10
11
12
13
14 (Default)
(USA: T_{Lim_min} = 228 µs, Europe: T_{Lim_min} = 232 µs)
61
62
63
Table 10. Effect of the Configuration Word Lim_max
Lim_max
Lim_max < 12 is not applicable
0
0
1
1
0
0
0
0
1
1
0
1
0
0
1
1
1
0
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
0
1
1
0
0
0
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
1
1
1
1
0
1
1
1
1
1
1
0
1
1
1
1
1
1
Upper Limit Value for Bit Check
(T_{Lim_max} = (Lim_max - 1) × XLim × T_Clk)
12
13
14
24 (Default)
(USA: T_{Lim_max} = 375 µs, Europe: T_{Lim_max} = 381 µs)
61
62
63
Conservation of the Register
Information
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_S drops below the threshold voltage V_ThReset. The default parameters are pro-
grammed into the configuration registers in that condition. Once V_S exceeds V_ThReset,
the POR is canceled after the minimum reset period t_Rst. A POR is also 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 represented by the fixed frequency f_RM at a 50% duty cycle. RM can be
canceled via an ‘L’ pulse t1 at pin DATA. The RM implies the following characteristics:
20 U3741BM
4662B–RKE–10/04