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L7585G Datasheet(PDF) 7 Page - Agere Systems |
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L7585G Datasheet(HTML) 7 Page - Agere Systems |
7 / 22 page Agere Communications Inc. 7 Data Sheet September 2001 L7585G Full-Feature, Low-Power SLIC and Switch Operating States The L7585 has 14 operating states. These states are selected using 4 bits, B0—B3, according to the truth table shown in Table 2. The operation of the L7585 is undefined for unassigned states. Additionally, bit B4 independently operates the test-in access contacts so that all states are available for self-test; and bit B5 independently operates a relay driver, regardless of the status of bits B0—B4. All 6 bits are loaded via the par- allel data interface and chip select lead NCS. Table 2. B0—B3 Input State Coding Table 3. B4—B5 Input State Coding Forward Battery Active State s Normal talk and forward battery feed state. s All circuits are powered up and active. s Pin PT is positive with respect to pin PR (forward bat- tery). s SW2, SW2a, SW4, and SW4a closed; SW1, SW3, SW5, and SW6 open. s NDET reflects the status of the switchhook detector. Ground Start/Tip Open State s Ground start idle supervision state. s Ring lead continuity test state (tone injected at the receive port) in forward battery. s Same as forward battery active state, but with SW2 and SW2a open, and the tip drive amplifier powered down. s Pin PT is high impedance (>100 k Ω). s The ring current limit is approximately equal to the value programmed for the high-current active state current limit. Current limit is achieved by reducing the ring lead voltage only (see Table 6). s NDET indicates an off-hook when the ring current (flowing into PR) is twice the value programmed for the switchhook detector in the forward battery active state. B3 B2 B1 B0 State 1 1 1 1 Forward Battery Active 1 1 1 0 Ground Start/Tip Open 1 1 0 1 Ground Start/Tip Ground 1 1 0 0 Forward Battery Ring Open 1 0 1 1 Ringing (Battery Backed) 1 0 1 0 Disconnect State 1 0 0 1 Forward Battery Low-Current Active State 1 0 0 0 High Impedance 0 1 1 1 Reverse Battery Active 0 1 1 0 Reverse Battery Tip Open 0 1 0 1 Ground Start/Tip Amplifier 0 1 0 0 Reverse Battery Ring Open 0 0 1 1 Ringing (Earth Backed) 0 0 1 0 Unassigned 0 0 0 1 Reverse Battery Low-Current Active State 0 0 0 0 High Impedance Bit State B4 1 Test-in contacts off. 0 Test-in contacts on. B5 1 Relay driver off. 0 Relay driver on. |
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