U4091BM-RFNY19 Atmel, U4091BM-RFNY19 Datasheet - Page 7

• Manufacturer Part Number: U4091BM-RFNY19
• Description: RF Wireless Misc COM.CORDED - FEATURE PHONE CIRCUIT
• Manufacturer: Atmel
• Type: Programmable Telephone Audio Processorr

Specifications of U4091BM-RFNY19

• Operating Frequency: 100 KHz
• Operating Temperature Range: - 55 C to +150 C
• Package / Case: SSO-44
• Mounting Style: SMD/SMT

4. Supply Structure of the Chip
4872B–CORD–01/11
A main benefit of the Atmel
to the flexible system structure of the chip.
Possible applications:
The special supply topology for the various functional blocks is shown in
There are four major supply states:
Figure 4-1.
• Group listening phone
• Hands-free phone
• Phones which feature ringing with the built-in speaker amplifier
• Answering machine with external supply
1. Speech condition
2. Power down (pulse dialing)
3. Ringing
4. External supply
In speech condition, the system is supplied by the line current. If the LIDET block
detects a line voltage above approximately 2V, the internal signal VLON is activated.
This is detected via the serial bus, all the blocks which are needed have to be
switched on via the serial bus.
For line voltages below 2V, the switches remain in quiescent state as shown in the
diagram.
When the chip is in power-down mode (bit LOMAKE), for example, during pulse dial-
ing, all internal blocks are disabled via the serial bus. In this condition, the voltage
regulators and their internal band gap are the only active blocks.
During ringing, the supply for the system is fed into VB via the Ringing Power Con-
verter (RPC). Normally, the speaker amplifier in single-ended mode is used for
ringing. The frequency for the melody is generated by the DTMF/Melody generator.
In an answering machine, the chip is powered by an external supply via pin VB. The
answering machine connections can be directly made to Atmel U4091BM-R. The
answering machine is connected to the pin AMREC. For the output AMREC, an AGC
function is selectable via the serial bus. The output of the answering machine will be
connected to the pin AMPB, which is directly connected to the switching matrix. This
enables the signal to be switched to every desired output.
Supply Generator
V
L
R
C
SENSE
R
10
1µF
IND
®
U4091BM is the easy implementation of various applications due
R
300kΩ
+
-
V
+
+
-
-
3.3V
Atmel U4091BM-R
5.5V
5.5V
V
220µF
V
47µF
470µF
MPS
MP
V
B
Figure 4-1 on page
7.
7