Datasheet

LNBH23L LNBH23L software description
Doc ID 15335 Rev 4 17/25
X = don't care
All values are typical unless otherwise specified
Valid with TTX pin floating
7.4 Diagnostic received data (I²C read mode)
LNBH23L can provide to the MCU 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 clocks bits, LNBH23L
issues a byte on the SDA data bus line (MSB transmitted first). At the ninth clock bit the
Master can:
● Acknowledge the reception, starting in this way the transmission of another byte from
the LNBH23L
● 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), two bits convey diagnostic information about the over-
temperature (OTF), output over-load (OLF) and three bit are for internal usage (TEST1-2-3)
and must be disregarded by the MCU software. 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 TEST4 TEST5 Function
000100V
oRX
= 13.4 V, V
UP
= 14.5 V, (V
UP
- V
oRX
= 1.1 V)
001100V
oRX
= 18.4 V, V
UP
= 19.5 V, (V
UP
- V
oRX
= 1.1 V)
010100V
oRX
= 14.4 V, V
UP
=15.5 V, (V
UP
-V
oRX
=1.1 V)
011100V
oRX
= 19.5V, V
UP
=20.6 V, (V
UP
-V
oRX
=1.1 V)
00 10 0
Internal 22 kHz generator disabled, EXTM
modulation enabled
10 10 0
Internal 22 kHz controlled by DSQIN pin (only if
TTX=1)
1 1 1 0 0 Internal 22 kHz tone output is always activated
0100
V
oRX
output is ON, V
oTX
Tone generator output is
OFF
1100
V
oRX
output is ON, V
oTX
Tone generator output is
ON
0 X 1 0 0 Pulsed (Dynamic) current limiting is selected
1 X 1 0 0 Static current limiting is selected
X X X X X 0 0 0 Power block disabled