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VNF1248F Datasheet(PDF) 48 Page - STMicroelectronics

Part # VNF1248F
Description  High-side switch controller with intelligent fuse protection for 12 V, 24 V and 48 V automotive applications
PDF  79 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

VNF1248F Datasheet(HTML) 48 Page - STMicroelectronics

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Table 44. Clear all status registers (RAM access)
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Command
OC1
OC0
Address
1
0
1
1
1
1
1
1
DATA1
X(1)
X
X
X
X
X
X
0
0
0
0
0
0
0
DATA2
X
X
X
X
X
X
X
0
0
0
0
0
0
0
DATA3
X
X
X
X
X
X
X
0
0
0
0
0
0
0
1. X: do not care
12.10
Global status byte
As per the ST SPI 4.1 specification, the device features an in-frame response mechanism.
A global status byte is transmitted to the SPI master on the SDO line while the command byte is received on the
SDI line.
The global status byte reports the global status of the device:
Table 45. Global status byte
MSB
30
29
28
27
26
25
LSB
GSBN
RSTB
SPIE
AUTOON
DIAGS
DE
OVC
FS
Table 46. Global status byte - Bit description
Bit #
Name
Description
31
GSBN
Global status bit NOT
This bit is a NOR combination of the remaining bits of this register:
GSBN = NOT (RSTB or SPIE or AUTOON or DIAGS or DE or OVC or FS)
This bit can also be used as the global status flag without starting a complete communication frame as it is
present directly after pulling CSN low.
30
RSTB
Reset bit
The RSTB indicates a device hardware reset. This bit is set in power-on mode. All internal control registers
are set to default and kept in that state until the bit is automatically cleared by the first valid SPI
communication.
29
SPIE
SPI error
The SPIE is a logical OR combination of errors related to a wrong SPI communication: SDI stuck-at fault,
SPI frame length ≠ 32 bit (wrong number of clock pulses while CSN is low), parity check error
28
AUTOON
AUTOON
The AUTOON indicates the automatic turn-on of the external FET due to low current bypass desaturation
(BYPASS_SAT = 1) when its VDS exceeds a fixed threshold (VDS_BYPASS_SAT).
AUTOON = BYPASS_SAT
27
DIAGS
Diagnostic signal bit
The DIAGS is a logical OR combination of all faults, which cause the external FET to be switched off
DIAGS = VS_UV or HSC or VDS_MAX or FUSE_LATCH or DEV_OVT or NTC_OVT or VGS_LOW or
DIS_OUT_FAULT or CS_UV
26
DE
Device error bit
VNF1248F
SPI functional description
DS14109 - Rev 7
page 48/79



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