LNBH24PPR STMicroelectronics, LNBH24PPR Datasheet - Page 14

• Manufacturer Part Number: LNBH24PPR
• Description: IC LNB SUPPLY/CTRL DUAL PWRSSO36
• Manufacturer: STMicroelectronics

Specifications of LNBH24PPR

• Applications: Converter, Analog and Digital Satellite STB Receivers/SatTV
• Voltage - Input: 8 ~ 15 V
• Number Of Outputs: 2
• Voltage - Output: 13.4V, 18.5V
• Operating Temperature: 0°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: PowerSO-36 Exposed Bottom Pad
• Output Voltage: 19.5 V
• Output Current: 750 mA
• Input Voltage: 8 V to 15 V
• Switching Frequency: 220 KHz
• Operating Temperature Range: - 25 C to + 125 C
• Mounting Style: SMD/SMT
• For Use With: 497-8718 - DEMO BOARD BASED ON LNBH24LNBH24DEMOBOARD - DEMO BOARD FOR LNBH24
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-6882-2; LNBH24PPR

6
6.1
6.2
6.3
6.4
6.5
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I²C bus interface
Data transmission from main MCU to the LNBH24 and vice-versa takes place through the 2
wires I²C bus Interface, consisting of the 2 SDA and SCL lines (pull-up resistors to positive
supply voltage must be externally connected).
Data validity
As shown in
the clock. The HIGH and LOW state of the data line can only change when the clock signal
on the SCL line is LOW.
Start and stop condition
As shown in
SCL is HIGH. The stop condition is a LOW to HIGH transition of the SDA line while SCL is
HIGH. A STOP condition must be sent before each START condition.
Byte format
Every byte transferred to the SDA line must contain 8 bits. Each byte must be followed by an
acknowledge bit. The MSB is transferred first.
Acknowledge
The master (MCU) puts a resistive HIGH level on the SDA line during the acknowledge clock
pulse (see
the SDA line during the acknowledge clock pulse, so that the SDA line is stable LOW during
this clock pulse. The peripheral which has been addressed has to generate acknowledge
after the reception of each byte, otherwise the SDA line remains at the HIGH level during the
ninth clock pulse time. In this case the master transmitter can generate the STOP
information in order to abort the transfer. The LNBH24 will not generate acknowledge if the
V
Transmission without acknowledge
Avoiding to detect the acknowledges of the LNBH24, the MCU can use a simpler
transmission: simply it waits one clock without checking the slave acknowledging, and sends
the new data. This approach of course is less protected from malfunctions and decreases
the noise immunity.
CC
supply is below the under-voltage lockout threshold (6.7 V typ.).
Figure
Figure 5
Figure 6
7). The peripheral (LNBH24) that acknowledges has to pull-down (LOW)
the data on the SDA line must be stable during the high semi-period of
a start condition is a HIGH to LOW transition of the SDA line while