L9300 datasheet(39/182 Pages) STMICROELECTRONICS

39 / 182 page

All outputs are independently protected against a short to battery condition. Short to battery protection

disconnects the channel from its supply rail to guarantee that no adverse condition occurs within the IC. The

short-to-battery detection circuit has input offset voltage (10 mV, minimum) to prevent disconnecting of the output

under an open circuit condition.

In order to prevent back feeding, a reverse protection diode is integrated. A short to battery is detected when the

output TRKn pin voltage increases above the supply pin voltage for a TSTBTH time. An internal up-counter will

count in 1.5 µs increment up to TSTBTH. The counter will be cleared if the short condition is not present for at

least 1.5 µs. Other channels are not affected in case of short of one output pin. Output in short resumes normal

operation once the fault condition is removed. As in the case previously described, the fault code can be read

from fault bits.

Leakage to Battery, Open condition

The sensor interface also offers an open condition detection. The auto-adjusting counter for satellite current

sensing will drop in case the current flowing through TRKn pin is lower than 1mA. The fault code can be read from

fault bits. The channel in this condition is not shutdown.

Leakage to Ground

The sensor interface offers as well the detection of a leakage to ground condition that will possibly raise

the sensor current higher than operating range, but still lower than the overcurrent detection threshold. The

CURRENT_HI fault flag is asserted when the fault condition lasts for longer than deglitch filter time. This fault flag

can be read from WSIRSDRx registers. The channel in this condition is not shutdown. Two leakage to ground

thresholds are implemented depending on the configured sensor: for standard 2 levels sensors, an instantaneous

threshold is set, while for other sensors a lowest threshold on evaluated base current can be used. Selection of

the proper threshold is automatically done configuring the sensor via SPI registers.

Thermal shutdown

Each output is protected by an over-temperature detection circuit: in case the remote sensor interface thermal

protection is triggered, only the output stage that provides a current limitation flag is disabled and a corresponding

thermal fault is latched (WSITEMP) and reported in the Remote Sensor Data Register (WSIRSDRx). The thermal

fault flag is cleared when the sensor channel is first disabled and then re-enabled through the Remote Sensor

Configuration Register (WSIRSCRx). The digital channel stays off until the register fault is set while the wheel

speed supply automatically recovers as soon as the fault condition disappears.

8.5.3

WSI electrical characteristics

5.5 V ≤ VBATP ≤ 19 V; -40 °C ≤ Tj ≤ 175 °C, unless otherwise noticed. All voltages refer to GND pin.

Table 15. WSI electrical characteristics

Symbol

Parameter

Test condition

Min

Typ

Max

Unit

Configuration Input

VIL

Logic Input Low Voltage

0.75

TRK_SEL

VIH

Logic Input High

Voltage

1.75

TRK_SEL

Vhysteresis

Input hysteresis Voltage

0.1

TRK_SEL

TRK_SELPD

TRK_SEL pull down

TRK_SEL = 5 V

100

µA

TRK_SEL

Tracking Regulator Configuration

ITRKn

Output load current

Application note

100

TRKn

CTRKn

Output capacitor

Application note

-25%

2.2

+25%

µF

TRKn

CTRKn ESR

Output capacitor ESR

Application note f ≤ 150 kHz

0.01

Ω

TRKn

CTRKn EXT

External sensor

capacitor

Application note max drivable cap

in parallel with CTRKn

150

µF

TRKn

TRK_SEL vol

TRK_SEL range

Application note

TRK_SEL

TRKn_Vout

Regulated output

voltage

3.3 V ≤ TRK_SEL ≤ 5 V VDD1 ≥

6 V, 10 mA ≤ ITRKn ≤ 100 mA

TRK_SEL –

20 mV

TRK_SEL

TRK_SEL +

20 mV

TRKn

L9300

TRK 1, 2, 3, 4

DS12258 - Rev 4

page 39/182

L9300 Datasheet(PDF) 39 Page - STMicroelectronics

L9300 Datasheet(HTML) 39 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL