nw6003 Integrated Device Technology, nw6003 Datasheet - Page 8

• Manufacturer Part Number: nw6003
• Description: Type Ii Caller Id Decoder
• Manufacturer: Integrated Device Technology

NW6003 TYPE II CALLER ID DECODER
OTHER FUNCTIONS
POWER-DOWN MODE
consumption. By activating the PWDN pin (high), the gain adjustable
op amp, oscillator and all other internal circuits besides the ring
detection circuit are all disabled. The TRIGIN, TRIGRC and TRIGOUT
pins are not affected, the device can still react to call arrival indicator
and activate the interrupt to wake up the microcontroller.
CRYSTAL OSCILLATOR
required for NW6003. The crystal can be directly connected between
OSCIN and OSCOUT pins without any external component. If an
external clock source is used, OSCIN pin should be driven by the
clock source and OSCOUT pin is left floating or is used to drive other
devices. Figure 10 shows some applications.
(a)
(b) Common Crystal Connection of Several Devices Sharing
One Timing Source
INTERRUPT
interrupt the microcontroller. Either TRIGOUT low, STD high or DR low
will activate the INT and it will remain active ‘low’ until all of these three
pins return to an inactive state. The microcontroller should read these
pins through input ports to detect the interrupt type (TRIGOUT, STD or
DR) and to make the correspondent response.
The device provides the power down feature to reduce the power
A 3.579545 MHz crystal oscillator or other external clock source is
Connection of One Device with Crystal Oscillator
The NW6003 provides an open drain interrupt output INT to
OSCIN
3.579545MHz
NW6003
Figure 10. Applicaiton of Clock Driven Circuit
OSCOUT
OSCIN
OSCIN
3.579545MHz
NW6003
NW6003
OSCOUT
OSCOUT
OSCIN
NW6003
to the next device
OSCOUT
8
TRIGRC has no initial charge) and STD will be high if PWDN is low
(no charge across the capacitor at ST/GT pin in Figure 7), interrupt
signal will be generated. The microcontroller should ignore interrupts
from these sources on the initial power up until there is sufficient time
to charge the capacitors. Also, by asserting PWDN high immediately
after system power up, STD will become low and no interrupt will be
generated. In power-down mode, EST and comparator output are
forced low, the charging switch will turn on, and the capacitor at ST/GT
pin will charge up more rapidly.
BIAS VOLTAGE GENERATOR
source equal to VCC/2 on pin VREF and is used to bias the op amp.
To reduce the noise, a 0.1 F capacitor should be connected between
CAP and GND pins.
When the system is first powered up, TRIGOUT will be low (C3 at
The bias voltage generator provides a low impedance voltage
INDUSTRIAL TEMPERATURE RANGE