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ST7LNB0STMN/a2760avaiDiSEqC" 2.1 Slave Microcontroller for LNBs and Switchers


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ST7LNB0
DiSEqC" 2.1 Slave Microcontroller for LNBs and Switchers
December 2004 1/22
Rev. 3.0
ST7LNB0

DiSEqC™ 2.1 Slave Microcontroller for LNBs and Switchers
The ST7LNB0 is an 8-bit microcontroller dedicat-
ed to DiSEqC™ slave operation in LNBs and
switchers, it is compliant with the DiSEqC™ 2.1
level, also it supports backwards compatible (13/
18 V, 22 kHz tone) and toneburst signalling. Clock, Reset and Supply Management Reduced power consumption. Safe power on/off management by low volt-age detector (LVD). Internal 8 MHz oscillator Communication interface One DiSEqC™ 2.1 communication interface Analog interface 13/18 V voltage detector 22 KHz tone detector I/O ports 8 output ports for control of committed and un-committed switches 1 output port for standby control
Figure 1. ST7LNB0 Block Diagram
Table 1. Device Summary
1 ST7LNB0 PIN DESCRIPTION
Figure 2 ST7LNB0 Pinout

The following table gives the pin functions
Table 2. ST7LNB0 Pin Functions
Notes:

1. During normal operation this pin must be pulled- up, internally or externally (external pull-up of 10k mandatory in noisy
environment). This is to avoid entering ICC mode unexpectedly during a reset. In the application, even if the pin is con-
figured as output, any reset will put it back in input pull-up
2. Unused pins 15 and 16 must be tied to ground.









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