Datasheet

ManualsBrandsSTMICROELECTRONICS ManualsPMICsPMIC - ELCs Low side SOIC 20

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L9825

September 2013

■

OUTPUTS CURRENT CAPABILITY UP TO

1A, R

ON

≤ 0,75Ω AT T

J

= 25°C

■

PARALLEL CONTROL INPUTS FOR

OUTPUTS 1 AND 2

■

SPI CONTROL FOR OUTPUTS 1 TO 8

■

RESET FUNCTION WITH RESET SIGNAL AT

NRES PIN OR UNDERVOLTAGE AT V

CC

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INTRINSIC OUTPUT VOLTAGE CLAMPING

AT TYP. 50V

■

OVERCURRENT SHUTDOWN AT OUTPUTS

1 TO 6

■

SHORT CIRCUIT CURRENT LIMITATION

AND SELECTIVE THERMAL SHUTDOWN AT

OUTPUTS 7 AND 8

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OUTPUT STATUS DATA AVAILABLE ON THE

SPI

DESCRIPTION

L9825 is a Octal Low-Side Driver Circuit, dedicated

for automotive applications. Output voltage clamping

is provided for flyback current recirculation, when in-

ductive loads are driven. Chip Select and Serial Pe-

ripheral Interface for outputs control and diagnostic

data transfer. Parallel Control inputs for two outputs.

PowerSO20

ORDERING NUMBER: L9825

Octal Low-side Driver For Resistive and Inductive Loads With

Serial / Parallel Input Control, Output Protection and Diagnostic

BLOCK DIAGRAM

NCS

SDI

CLK

SDO

NON1

OUT1

OUT2

OUT3

OUT4

OUT5

OUT6

OUT7

OUT8

GND

Diag1

Diag8

nRES

Q1

CH1

Diag1

+

-

CH7

Diag7

Q7

Q1

Q8

CH3

Diag3

Q3

+

-

CH4

CH5

CH6

CH2

NON2

Diag2

Diag4

Q4

Diag5

Q5

Diag6

Q6

Q8

CH8

Diag8

Fault Latch

Q2

Reset

Shift Register

Output Latch

SPI

Interface

R

S

Latch / Driver

Reset

Undervoltage

RESET

+

-

Current Control

Overtemperature Detection

3

1

2

S

R

Latch / Driver

S

R

Latch / Driver

Q2

Q3

Q4

Q5

Q6

Q7

Diag2

Diag3

Diag4

Diag5

Diag6

Diag7

V

CC

V

CC

V

CC

V

CC

V

CC

V

CC

V

CC

V

CC

V

DG

I

OL

I

OL

V

DG

I

OL

V

DG

Summary of content (11 pages)

PAGE 1
L9825 Octal Low-side Driver For Resistive and Inductive Loads With Serial / Parallel Input Control, Output Protection and Diagnostic ■ ■ ■ ■ ■ ■ ■ ■ OUTPUTS CURRENT CAPABILITY UP TO 1A, RON ≤ 0,75Ω AT TJ = 25°C PARALLEL CONTROL INPUTS FOR OUTPUTS 1 AND 2 SPI CONTROL FOR OUTPUTS 1 TO 8 RESET FUNCTION WITH RESET SIGNAL AT NRES PIN OR UNDERVOLTAGE AT VCC INTRINSIC OUTPUT VOLTAGE CLAMPING AT TYP.
PAGE 2
L9825 PIN CONNECTION (Top view) GND 1 20 NON1 2 19 NCS SDO 3 18 nRes OUT1 4 17 OUT8 OUT3 5 16 OUT6 OUT5 6 15 OUT4 OUT7 7 14 OUT2 SDI 8 13 Vcc CLK 9 12 NON2 GND 10 11 GND POWSO20 PIN DESCRIPTION N° Pin 1 GND device ground 2 NON1 control input 1 3 SDO serial data output 4 Out 1 output 1 5 Out 3 output 3 6 Out 5 output 5 7 Out 7 output 7 8 SDI serial data input 9 CLK serial clock 10 GND device ground 11 GND device ground 12 NON2 cont
PAGE 3
L9825 ABSOLUTE MAXIMUM RATINGS For voltages and currents applied externally to the device: Symbol VCC Parameter Supply voltage Value Unit -0.3 to 7 V Inputs and data lines (NONx, NCS, CLK, SDI, nRes) VIN Voltage (NONx, NCS, CLK, SDI) -0.3 to 7 V VIN Voltage (nRes) -0.3 to 7 V IIN Protection diodes current 1) (T ≤ 1ms) -20 to 20 mA Continuous output voltage -1.0 to 45 V Output current 2) -3 to 2.05 A 20 mJ Outputs (Out1 ... Out8) VOUTc IOUT EOUTcl Output clamp energy (IOUT ≤ 0.
PAGE 4
L9825 ELECTRICAL CHARACTERISTCS (4.5V ≤ VCC ≤ 5.5V; -40°C ≤ TJ ≤ 150°C; unless otherwise specified) Symbol Parameter Test Condition Min. Typ. Max. Unit Supply voltage IccSTB Standby current without load 5 mA IccOPM Operating mode IOUT1 ... 8 = 500mA SPI - CLK = 3MHz NCS = LOW SDO no load 5 mA ΔICC during reverse output current Iout = -3A 100 mA ΔICC Inputs (NONx. NCS, CLK, SDI, nRes) VINL Low level -0.3 0.2·VCC V VINH High level 0.7·VCC VCC+0.
PAGE 5
L9825 ELECTRICAL CHARACTERISTCS (continued) (4.5V ≤ VCC ≤ 5.5V; -40°C ≤ TJ ≤ 150°C; unless otherwise specified) Symbol Parameter Test Condition Min. Typ. Max. Unit 0.32·VCC 0.4·VCC V 20 100 µA 15 50 µs Diagnostics VDG Diagnostic threshold voltage IOL Open load detection sink current tdf Diagnostic detection filter time for output 1 & 2 on each diagnostic condition Vout = VDG Outputs timing tdon1 Turn ON delay of OUT 1 and 2 NON1, 2 = 50% to VOUT = 0.9·Vbat NCS = 50% to VOUT = 0.
PAGE 6
L9825 FUNCTIONAL DESCRIPTION General The L9825 integrated circuit features 8 power low-side-driver outputs. Data is transmitted to the device using the Serial Peripheral Interface, SPI protocol. Outputs 1 and 2 can be controlled parallel or serial. The power outputs features voltage clamping function for flyback current recirculation and are protected against short circuit to Vbat.
PAGE 7
L9825 Figure 2. Output Control register structure MSB LSB Q2 Q4 Q6 Q8 Q1 Q3 Q5 Q7 Control-bit output 7 Control-bit output 5 Control-bit output 3 Control-bit output 1 Control-bit output 8 Control-bit output 6 Control-bit output 4 Control-bit output 2 Power outputs characteristics for flyback current, outputs short circuit protection and diagnostics For output currents flowing into the circuit the output voltages are limited. The typical value of this voltage is 50V.
PAGE 8
L9825 Fault condition 2) "open load" or "output short circuit to GND" : the output is switched off and the voltage at the output drops below the diagnostics threshold, because the load current is lower than the output diagnostic current source, the load is interrupted. The diagnostic bit is low. For outputs 3 to 8 the output status signals, are fed directly to the SPI register. Table 3. Diagnostic for outputs 1 to 8 in SPI controlled mode. Output 1 ...
PAGE 9
L9825 APPLICATION NOTES Figure 5. Typical Application Circuit Diagram L9825 L9825 For higher current driving capability two outputs of the same kind can be paralleled. In this case the maximum flyback energy should not exceed the limit value for single output. The immunity of the circuit with respect to the transients at the output is verified during the characterization for Test Pulses 1, 2 and 3a, 3b, DIN40839 or ISO7637 part 3. The Test Pulses are coupled to the outputs with 200pF series capacitor.
PAGE 10
L9825 DIM. mm MIN. TYP. A a1 inch MAX. MIN. TYP. 3.6 0.1 0.3 a2 0.142 0.004 0.012 3.3 0.130 a3 0 0.1 0.000 0.004 b 0.4 0.53 0.016 0.021 c 0.23 0.32 0.009 0.013 D (1) 15.8 16 0.622 0.630 0.386 D1 (2) 9.4 9.8 0.370 E 13.9 14.5 0.547 e 1.27 e3 E1 (1) 0.570 0.450 11.1 E2 0.429 0.437 2.9 0.114 E3 5.8 6.2 0.228 G 0 0.1 0.000 0.004 H 15.5 15.9 0.610 0.626 0.031 0.043 h L 0.244 1.1 0.8 1.1 0.043 N 8˚(typ.) S 8˚(max. ) T Weight: 1.9gr 0.
PAGE 11
L9825 Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale.