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| 型号： | TLE7242-2G |
| 厂商： | INFINEON TECHNOLOGIES AG |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO28 |
| 封装： | GREEN, PLASTIC, DSO-28 |
| 文件页数： | 9/50页 |
| 文件大小： | 1210K |
| 代理商： | TLE7242-2G |
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Data Sheet
17
Rev. 1.0, 2008-07-09
TLE7242-2G
Functional Description and Electrical Characteristics
fault is detected. Certain faults can be prevented from activating the FAULT pin by setting the fault mask register
in SPI message #7.
Once a fault is detected it is latched into the FAULT register. The microcontroller can access the FAULT register
by sending SPI message #9.
If the RESET_B line transitions high-to-low, a RL bit is latched into the FAULT register. The register is cleared after
it is read from the SPI. The RL bit in the FAULT register will not be set again until the next high-to-low transition
occurs on the RESET_B pin.
If the ENABLE pin voltage is low, the ENL bit is latched in the FAULT register. The ENL bit is cleared when the
ENABLE pin returns to a high state and the FAULT register is accessed by SPI message #9.
The diagnostic delay timers for the on-state and off-state diagnostic functions are derived from the master clock
signal applied to the pin CLK using a programmable predivider. This predivider is programmable by the DT1 and
DT0 bits in SPI message #7.
Three fault types in 4 different fault bits are defined:
The fault bit is 1 if the fault is detected.
Note: In order to differentiate between a Short to Ground Failure and an Open Load Failure, the channel must be
turned off (setpoint = 0ma).
Tested Diagnostic Bits
The tested bits allow the distinction between a true No Fault and a No Fault due to an untested state (the detection
interval has yet to occur). For instance when the calculated duty cycle is too low to complete the short to battery
test.
Table 1
Timebase for Diagnostics
DT1
DT0
Pre-divider
Tested Timer and Fault Detection Timer
Period.
FCLK=20 MHz
FCLK=40 MHz
00
128
64
sec
32
sec
01
192
96
sec
48
sec
10
192
96
sec
48
sec
1
256
128
sec
64
sec
Table 2
Diagnostic Flags / Bits
Fault Type
Abr.
Gate is ON
Gate is OFF
Short to Ground Fault
SG
OL-ON-F reported (=0 in
ON/OFF mode)
Bit SG-F
Short to Battery Fault
SB
Bit SB-F
Open Load Fault
OL
BIT OL-ON-F
(=0 in ON/OFF mode)
Bit OL-OFF-F
10
9
*
_
≤
=
fault
CLK
fault
PERIOD
DIAG
n
F
predivider
n
t
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