U3741BM Datasheet, PDF (18/32 Pages) ATMEL Corporation – UHF ASK RECEIVER IC

Table 2. Effect of Bit 1 and Bit 2 in Programming the Registers
Bit 1
Bit 2
Action
1
x
The receiver is set back to polling mode (OFF command)
0
1
The OPMODE register is programmed
0
0
The LIMIT register is programmed
Table 4 and the following illustrate the effect of the individual configuration words. The
default configuration is highlighted for each word.
BR_Range sets the appropriate baud rate range. At the same time it defines XLim. XLim
is used to define the bit check limits T_{Lim_min} and T_{Lim_max} as shown in Table 4.
POUT can be used to control the sensitivity of the receiver. In that application, POUT is
set to 1 to reduce the sensitivity. This implies that the receiver operates with full sensitiv-
ity after a POR.
Table 3. Effect of the Configuration Words within the Registers
Bit1 Bit2 Bit2
Bit4
Bit5
Bit6
Bit7
Bit8
Bit9
Bit10
Bit11
Bit12
Bit13
Bit14
OFF Command
1
OPMODE Register
01
01
(Default)
BR_Range
Baud1 Baud0
0
0
N_Bitcheck
BitChk1 BitChk0
1
0
V_POUT
POUT
0
Sleep4
0
Sleep3
1
Sleep
Sleep2
0
Sleep1
1
Sleep0
1
X_Sleep
X_{Sleep Std} X_{Sleep Temp}
0
0
LIMIT Register
00
Lim_min
Lim_max
0 0 Lim_min5 Lim_min4 Lim_min3 Lim_min2 Lim_min1 Lim_min0 Lim_max5 Lim_max4 Lim_max3 Lim_max2 Lim_max1 Lim_max0
(Default)
0
0
1
1
1
0
0
1
1
0
0
0
Table 4. Effect of the Configuration Word BR_Range
BR_Range
Baud1
Baud0
Baud Rate Range/Extension Factor for Bit Check Limits (XLim)
BR_Range0 (application USA/Europe: BR_Range0 = 1.0 kBaud to 1.8 kBaud) (Default)
0
0
XLim = 8 (Default)
BR_Range1 (application USA/Europe: BR_Range1 = 1.8 kBaud to 3.2 kBaud)
0
1
XLim = 4
BR_Range2 (application USA/Europe: BR_Range2 = 3.2 kBaud to 5.6 kBaud)
1
0
XLim = 2
BR_Range3 (Application USA/Europe: BR_Range3 = 5.6 kBaud to 10 kBaud)
1
1
XLim = 1
18 U3741BM
4662B–RKE–10/04