Diseqc TM 2.1 Slave Microsontroller - ST Microelectronics
Description
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ST7LNB0
DiSEqC™ 2.
1 Slave Microcontroller for LNBs and Switchers
The ST7LNB0 is an 8-bit microcontroller dedicated 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 voltage 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 Figure 1.
ST7LNB0 Block Diagram
SO16 150”
■
I/O ports – 8 output ports for control of committed and uncommitted switches – 1 output port for standby control
Internal CLOCK 8 MHz.
RC OSC LVD VDD VSS RESET POWER SUPPLY CONTROL 8-BIT CORE ALU DiSEqC™ 2.
1
DTX
ADDRESS AND DATA BUS
22KHz tone Detector
DRX
13/18 V Detector
OP[8:1]
SWITCH PORTS
SBY
Table 1.
Device Summary
Features Packages Peripherals Operating Voltage Temperature range ST7LNB0Y0M6 SO16 150” DiSEqC™ 2.
1 communication interface, 22KHz tone detector, 13/18V detector 4.
5 V t0 5.
5 V -40°C to +85°C
Rev.
3.
0
December 2004 1/22
1
ST7LNB0
1 ST7LNB0 PIN DESCRIPTION
Figure 2 ST7LNB0 Pinout
VSS VDD RESET DRX OP5 OP6 OP7 OP8
1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9
NC NC DTX SBY OP1 OP2 OP3 OP4
The following table gives the pin functions Table 2.
ST7LNB0 Pin Functions Pin Number 1 2 3 4 5 6 7 8 9 10 1) 11 12 13 14 15,16 Function Name Vss VDD RESET DRX OP5 OP6 OP7 OP8 OP4 OP3 OP2 OP1 SBY DTX Function Description Ground Power Supply (+5 volts) Reset (active low) input Receive input output 5 (uncommitted port) output 6 (uncommitted port) output 7 (uncommitted port) output 8 (uncommitted port) output 4 (SO B/A) output 3 (SB/SA) output 2 (H/V) output 1 (Hi/Lo) STANDBY DiSEqC™ data transmit output Not used pins 2)
Notes: 1.
During normal operation this pin must be pulled- up, internally or externally (externa...
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