ST70136B STMICROELECTRONICS [STMicroelectronics], ST70136B Datasheet - Page 12

• Manufacturer Part Number: ST70136B
• Description: CPE ADSL ANALOG FRONT END
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

ST70136
4.8 - Tone Detector
The tone detector is dedicated for remote activation. It operates during SUSPEND mode with PWD = 0
only. When the tone detector level received Vin over tone 40 or 72 is greater than 15 V peak to peak, the
ACTD pin is set to wake up the modem.
ACTD pin is resetted when the AFE is back in full operating mode (SUSPEND = 0, PWD = 0). The maxi-
mum signal sensitivity at the Tone detector inputs is 50mV peak to peak.
4.9 - Mode Management
4.9.1 - General
The ST70136 can be used in a various range of ATU-R equipments, but a specific mode management
address USB application in its different modes.
In following table, "CPE" is an USB ADSL modem application done with a ST70136 AFE and a ST70137
DMT. The CPE is connected to an USB port of an equipment.
Table 8 : ST70136 / USB Operating Mode Configurations
Figure 5 : USB Power Management Operating Modes
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SUSPEND
0
0
1
1
PWD
0
1
0
1
Active mode
The CPE application is in operative mode, its current consumption is less than 500 mA.
ST70136 is power-up, the Tone detector is OFF and CLKM output is enabled.
Enumerating mode
The CPE application is in the configuration process, plug in, its current consumption is
less than 100 mA.
ST70136 analog part is in power done mode, the digital part is enabled and CLKM
output is enabled.
Suspend mode after enumerating mode
After enumerating, the CPE application is in suspend mode, in this mode the CPE must
be able to wake up the equipment when a tone is received, its current consumption is
less than 2.5 mA.
ST70136 analog and digital parts are in power down mode, the Tone detector is
activated and CLKM output is disabled.
Stand by mode
The CPE is not configured and in stand by mode, it could be wake up only by the
equipment, its current consumption is less than 500 A.
ST70136 is fully in stand by mode and CLKM is disabled.
Enumerating mode
PWD = 1
SUSPEND = 0
Stand by mode
PWD = 1
SUSPEND = 1
Plug in
USB Mode Description
Suspend mode
PWD = 0
SUSPEND = 1
Active mode
PWD = 0
SUSPEND = 0