uba2051t NXP Semiconductors, uba2051t Datasheet - Page 28

• Manufacturer Part Number: uba2051t
• Description: Uba2050 A ; Uba2051 A;c One-chip Telephone Ics With Speech, Dialler And Ringer Functions
• Manufacturer: NXP Semiconductors

Philips Semiconductors
O
This section describes all the actions of the UBA205xx
during the on-line state. This state starts with making
output DP/FL HIGH (external pull-up resistor), which
makes line current flow possible.
Conversation state
In this state, conversation is possible.
Dialling state
During the dial-key entries the UBA205xx starts
immediately with transmission of the digit(s); the minimum
transmission time is unaffected by the speed of the entry.
Transmission continues as long as further dial-key entries
have to be processed.
2000 May 19
handbook, full pagewidth
N
One-chip telephone ICs with speech,
dialler and ringer functions
-
LINE STATE
[LNR/P], [M1 to M3], [MEM]
ON-LINE
MEMORY RECALL
off-hook
RINGER
end of recall
Fig.29 On-line states.
[0] to [9]
dial keys
CONVERSATION
off-hook
28
DIALLING
The on-line state contains a number of sub-states
(see Fig.29):
However when more than 32 digits are dialled the
LNR memory will overflow and the last number redial
function will be inhibited.
There are two dial modes: pulse dialling and tone dialling.
The initial dialling mode is determined by resistor option
PTS.
The state machine which controls the dialling mode is
illustrated in Fig.30.
Conversation state
Dialling state
Memory recall state
Program state.
STANDBY
end
[STORE]
on-hook/line break
UBA2050(A); UBA2051(A;C)
[M1 to M3], [MEM]
PROGRAM
[0] to [9]
MGU187
Product specification