U4091BM TEMIC Semiconductors, U4091BM Datasheet - Page 10

• Manufacturer Part Number: U4091BM
• Description: Programmable Telephone Audio Processor
• Manufacturer: TEMIC Semiconductors

Power-on Reset
To avoid undefined states of the system when it is
powered on, an internal reset clears the internal registers.
The system (U4091BM + microcontroller) is woken up
by any of the following conditions:
VMP > 2.75 V and VB > 2.95 V
and
or
or
The power-down of the circuit is caused by a shut-down
sent by the serial bus (SD = 1), low-voltage reset or by the
watchdog function (see figures 8, 9 and 10).
U4091BM
R12
R13
R14
R15
10 (29)
Register
line voltage (VL)
ringer (VRING)
external supply (ES)
DTMF
CLK
RTH
TM
TM
CLOR
CLOT
Group
R12B0
R12B1
R12B2
R12B3
R12B4
R12B5
R12B6
R12B7
R13B0
R13B1
R13B2
R13B3
R13B4
R13B5
R13B6
R13B7
R14B0
R14B1
R14B2
R14B3
R14B4
R14B5
R14B6
R14B7
R15B0
R15B1
R15B2
R15B3
R15B4
R15B5
R15B6
R15B7
No
Target Specification
DTMFF0
DTMFF1
DTMFF2
DTMFF3
DTMFF4
DTMFM0
DTMFM1
DTMFM2
CLK0
CLK1
RTH0
RTH1
RTH2
RTH3
TME0
TME1
TME2
TME3
free
CLOR0
CLOR1
CLOR2
CLOR3
CLOR4
free
free
free
CLOT0
CLOT1
CLOT2
CLOT3
CLOT4
Name
Watchdog Function
To avoid the system operating the microcontroller in a
wrong condition, the circuit provides a watchdog
function. The watchdog has to be retriggered every
second by triggering the serial bus (sending information
to the IC or other remoted components at the serial bus).
If there has been no bus transmission for more than one
second, the watchdog initiates a reset.
The watchdog provides a reset for the external
does not change the U4091BM’s registers.
Adjustment for calculated transmit log amp MSB
DTMF frequency selection
DTMF frequency selection
DTMF frequency selection
DTMF frequency selection
DTMF frequency selection
Generator mode selection
Generator mode selection
Generator mode selection
Selection clock frequency for
Selection clock frequency for
Ringer threshold adjustment LSB
Ringer threshold adjustment
Ringer threshold adjustment
Ringer threshold adjustment MSB
Test mode enable (low active)
Test mode enable (high active)
Test mode enable (high active)
Test mode enable (low active)
Adjustment for calculated receive log amp LSB
Adjustment for calculated receive log amp
Adjustment for calculated receive log amp
Adjustment for calculated receive log amp
Adjustment for calculated receive log amp MSB
Adjustment for calculated transmit log amp LSB
Adjustment for calculated transmit log amp
Adjustment for calculated transmit log amp
Adjustment for calculated transmit log amp
Description
m
m
C
C
Rev. A1, 02-Jun-98
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Status
m
C, but