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LNBH24 Datasheet(PDF) 17 Page - STMicroelectronics |
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LNBH24 Datasheet(HTML) 17 Page - STMicroelectronics |
17 / 30 page LNBH24 LNBH24 software description 17/30 X = don't care All values are typical unless otherwise specified Valid with TTX pin floating or connected GND 7.4 Diagnostic received data (I²C read mode) for both sections A/B The LNBH24 can provide to the master a copy of the diagnostic system register information via I²C bus in read mode. The read mode is master activated by sending the chip address with R/W bit set to 1. At the following master generated clock bits, the LNBH24 issues a byte on the SDA data bus line (MSB transmitted first). At the ninth clock bit the MCU master can: ● Acknowledge the reception, thus starting the transmission of another byte from the LNBH24 ● No acknowledge, stopping the read mode communication Three bits of the register are read back as a copy of the corresponding write output voltage register status (LLC, VSEL, EN), while the other five bits convey diagnostic information about the over-temperature (OTF), output voltage level (VMON), output overload (OLF), minimum output current presence (IMON) and 22 kHz tone (TMON). In normal operation the diagnostic bits are set to zero, while if a failure is occurring, the corresponding bit is set to one. At start-up all the bits are reset to zero. Table 6. Truth table PCL TTX TEN LLC VSEL EN ITEST AUX Function 00 0 1 0 VoRX= 13.4 V, VUP=14.15 V, (VUP-VoRX=0.75 V) 00 1 1 0 VoRX= 18.5 V, VUP=19.25 V, (VUP-VoRX=0.75 V) 01 0 1 0 VoRX= 14.4 V, VUP=15.15 V, (VUP-VoRX=0.75 V) 01 1 1 0 VoRX= 19.5 V, VUP=20.25 V, (VUP-VoRX=0.75 V) XX 1 X 1 VoRX= 22 V, VUP=22.75 V, (VUP-VoRX=0.75 V) 0 1 22 KHz controlled by DSQIN pin (only if TTX=1) 1 1 1 22 KHz tone output is always activated 01 VoRX output is ON, VoTX Tone generator output is OFF 11 VoRX output is ON, VoTX Tone generator output is ON 0 1 Pulsed (dynamic) current limiting is selected 1 1 Static current limiting is selected X X 1 0 Minimum output current diagnostic threshold = 6mA typ. X X 1 1 Minimum output current diagnostic threshold = 12mA typ. X X X X X 0 X X Power block disabled |
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