MLX83202 Datasheet, PDF (18/35 Pages) Melexis Microelectronic Systems – Automotive NFET pre-drivers

MLX83202/MLX83203
Automotive NFET pre-drivers
This sequence of capturing duty cycle and acknowledging continues until all error duty cycles are
communicated and the End Of Frame (EOF) duty cycle is being transmitted. By acknowledging this EOF all
error latches are reset and the ICOM line goes high again, until a new error is detected.
ICOM
(2)
(2)
(1)
Error 1
(3)
(1)
Error 2
(3)
Error 3
(2)
(1)
(3)
EOF
(2)
(1)
(3)
T
T
T
T
T
T
T
T
T
T
T
T
T
T
Tack
Tack
Tack
Tack
(1): MCU pulls ICOM low
(2): MLX8320x detects acknowledge on falling edge
(3): MCU releases ICOM line
Figure 9. ICOM serial interface for diagnostics information over a single wire
In case multiple errors occur at the same time, priority is defined: 0 is the highest priority and 16 is the lowest
priority. See Table 8 for an overview of all error conditions that are monitored, the corresponding PWM duty
cycle and the priority.
Priority
16
9
8
7
6
5
4
Input error
code
ICOM_EOF
EEP_ERR
VDD_UV
VSUP_OV
VSUP_UV
OVT
VREG_UV
3
VGS_UV
2
VBOOST_UV
1
VREG_OV
0
VDS_ERR
% Duty
cycle
93.5
55.0
49.5
44.0
38.5
33.0
27.5
22.0
16.5
11.0
5.5
Debounce
time
n/a
n/a
8us
2us
8us
2us
16us
2us
16us
2us
2us
Description
End of frame
EEPROM DED error
VDD Under Voltage
VSUP Over Voltage
VSUP Under Voltage
OVT (over temperature)
VREG Under Voltage
Vgs Under Voltage
This event can be masked by setting VGS_UV_COMP_EN=0
VBOOST Under Voltage
Voltage regulator over voltage
This event can be masked by setting VREG_OV_BF_EN=0
Vds Error =VDS_T1 || VDS_T2 || VDS_T3 || VDS_B1 ||
VDS_B2 || VDS_B3
Can be Masked by VDS_COMP_EN
To avoid erronous triggering due to switching there is a
programmable blanking time on top of the debounce time:
VDS_BLANKTIME[1:0].
Table 8. Overview diagnostic errors over ICOM
3901083203
Rev 2.2
Page 18 of 35
Prelim. Data Sheet
4 Dec 2013