L9305 datasheet(31/107 Pages) STMICROELECTRONICS

31 / 107 page

By default, diagnostic pull up/down current sources are disabled and comparator outputs are masked by internal

logic. To enable OFF state diagnostics, the channel must be in tri-state (set in the SOLENDRV register Solenoid

Driver State_x[1:0]=01) and enabled using register Channel_x.CONFIGURATION1, bit [5]. In case the desired

channel is put in tri-state after operation a false diagnostic can be sensed due to the time needed to discharge

output voltage through the load. To avoid incorrect fault detection, the fault comparators are masked for td_blank

filter time. The diagnostic blanking time is programmable through SPI register Channel_x.CONFIGURATION1, bit

D[9]. Blanking time is programmable to best align with external load values and ESD capacitor connected to the

output pin. Fault conditions are latched and cleared on SPI read, however they do not prevent from enabling the

solenoid channels. OFF state diagnostic comparators are the same for both HS and LS configuration and their

output is decoded from internal logic to set the SPI fault bits (Channel_x.EXCEPTIONS1) according to the

following tables

Table 14. LS diagnostic truth table

Comparator output

Fault detection

Exception registers

DIAGOL

DIAGLV

OPEN LOAD

SHORT

Normal operation – no fault-

Not possible

Open load

Short to ground

Table 15. HS diagnostic truth table

Comparator output

Fault detection

Exception registers

DIAGOL

DIAGLV

OPEN LOAD

SHORT

Short to Battery

Not possible

Open load

Normal operation – no fault-

6.5

Valve driver electrical specifications

4.75 V ≤ VDD ≤ 5.5 V; 5.5 V ≤ VBATP ≤ 19 V; VS_SOLx ≤ 19 V; VBATP-1 V ≤ VS_SOLx ≤ VBATP+1 V; -40 °C ≤

Tj ≤ 175 °C unless otherwise noted. All voltages refer to GNDA pin.

Table 16. Valve driver power stage electrical parameters

Symbol

Parameter

Test condition

Min Typ Max Unit

Solenoid driver power stage

Irev_VSx

VSx reverse current

Application note: in the application condition, no

impact on other functions, no reset generation

-3

–

VS_SOLx

Irev_LOADx

LOADx reverse

current

Application note: in the application condition, no

impact on other functions, no leakage from nearby

pins, no reset generation

-3

–

LOAD_SOLx

VSx_lkg

VSx current leakage

stby

Output disabled, VDD = 0 V, VS_SOLx = 13 V

-1

–

µA

VS_SOLx

LOADx_lkg

LOADx current

leakage tristate

Output disabled, VDD = 5 V, VS_SOLx = 13 V,

LOAD_SOLx = VS_SOLx or GND

-140

–

100

µA

LOAD_SOLx

HS_RdsON

High side RdsON

Tj = 150 °C, ILOAD = 1 A

–

0.33

Ω

LOAD_SOLx

HS_RdsON

High side RdsON

Tj = 175 °C, ILOAD = 1 A

–

0.375

Ω

LOAD_SOLx

LS_RdsON

Low side RdsON

Tj = 150 °C, ILOAD = 1 A

–

0.33

Ω

LOAD_SOLx

L9305

Current control drivers

DS12774 - Rev 10

page 31/107

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