Si4021
16
6. Low Battery Detector Command
bit 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
POR
1
1
0
0
0
0
1
0 dwc
0 ebs t4
t3
t2
t1
t0
C200h
Bit 7 <dwc> Disables the Wake-up timer periodical (every 30 second) calibration if this bit is set.
Bit 5 <ebs> Enables the TX bit synchronization circuit. The data rate must be set by the Data Rate Command.
The 5-bit value T of <t4 : t0> determines the threshold voltage V
lb
of the detector:
V
lb
= 2.25 V + T * 0.1 V
7. Sleep Command
bit 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
POR
1
1
0
0
0
1
0
0
s7 s6 s5 s4 s3 s2 s1 s0
C410h
The effect of this command depends on the Power Management Command. It immediately disables the power amplifier (if a0=1 and ea=0)
and the synthesizer (if a1=1 and es=0). Stops the crystal oscillator after S periods of the microcontroller clock (if a1=1 and ex=0) to enable
the microcontroller to execute all necessary commands before entering sleep mode itself. The 8-bit value S is determined by bits <s7 : s0>.
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