- -
53
17
XTAL2
I
crystal oscillator input 2
18
PHASEFIL
phase detector loop filter
19
PILFIL
pilot detector low-pass filter
20
n.c.
not connected
21
n.c.
not connected
22
VAFL
O
left audio frequency output voltage
23
VAFR
O
right audio frequency output voltage
24
TMUTE
I
time constant for soft mute
25
MPXO
O
FM demodulator MPX signal output
26
Vref
P
reference voltage
27
TIFC
I
time constant for IF centre adjust
28
LIMDEC1
I
decoupling IF limiter 1
29
LIMDEC2
I
decoupling IF limiter 2
30
n.c.
not connected
31
n.c.
not connected
32
Igain
I
gain control current for IF filter
33
AGND
analog ground
34
VCCA
P
analog supply voltage
35
RFI1
I
RF input 1
36
RFGND
RF ground
37
RFI2
I
RF input 2
38
TAGC
time constant RF AGC
39
LOOPSW
switch output of synthesizer PLL loop filter
40
n.c.
not connected
3.5.7 Function introduction to M41T62
1. Description
The M41T6x Serial Access TIMEKEEPER
®
is a low power Serial RTC with a built-in 32.768kHz
oscillator (external crystal controlled). Eight registers are used for the clock/calendar function and are
configured in binary coded decimal (BCD) format. An additional 8 registers provide status/control of Alarm,
32KHz output, Calibration, and Watchdog functions. Addresses and data are transferred serially via a two
line, bi-dire ctional I
2
C interface. The built-in address register is incremented automatically after each
WRITE or READ data byte.