33813 Datasheet, PDF (28/54 Pages) Freescale Semiconductor, Inc – One Cylinder Small Engine Control IC

Table 8. TACHOUT SPI Configuration Register
7
6
5
4
Retry
Enable
(0)
V_RSOUT/LSD
V_RSOUT/Osc.
mode
(0)
(0)
OL
Current
Sink
Enable
(0)
¸N₁₆
3
In- Rush
Delay
(0)
¸N₈
2
Output
Freq.
2
(0)
¸N₄
1
Output/PWM
Freq.
1
(0)
¸N₂
0
Output/PWM
Freq.
0
(1)
¸N₁
5.1.17 INJIN1 Input
The INJIN pin is the parallel inputs that controls the Injector output INJOUT1. The INJIN1 pin is logic level inputs with a built-in
pull-down to ground to prevent accidental actuation if the connection to the pin is lost. As a default, INJIN1 input is ORed with
the injector control bit in the SPI ON/OFF control word. This is to allow the INJOUT1 to be controlled by either the INJIN or via
the SPI when either Injector driver is being used for purposes other than injector drive.
5.1.18 INJOUT1 Driver Outputs
This output pin is the injector driver outputs for the one Injector that the IC supports. If an injector is not needed, one INJOUT1
can be used as a general purpose low side driver for relays, motors, lamps, gauges, etc. The injector driver outputs can be
controlled by the parallel input (INJIN1) or the appropriate bit in the SPI Injector Command register. The Injector output can also
be PWM’d via the SPI for use as variable speed motor drivers, LED/lamp dimming drivers, or as a fuel pump driver. The injector
output is forced off during all RESET events.
5.1.19 RIN1, RIN2 Inputs
The RIN1 and RIN2 pins are the parallel inputs that control the relay outputs, ROUT1 and ROUT2 respectively. The RIN1 and
RIN2 pins are 5.0 V logic level inputs with built-in pull-downs to ground to prevent accidental actuation of a relay if the connection
to the pin is lost. As a default, RIN1 and RIN2 inputs are ORed with the Relay control bits in the SPI ON/OFF control word. This
is to allow the ROUT’s to be controlled by either the RIN’s (parallel inputs) or via the SPI when either relay driver is being used
for purposes other than relay drive.
5.1.20 ROUT1, ROUT2 Driver Outputs
These are output pins for ROUT1 and ROUT2 low side drivers. These outputs have different current ratings and can be used to
drive relays or other inductive loads. Each output is controlled via the SPI or via the RINx logic inputs. Each output has a pull-
down current sink that can be enabled via the SPI to provide open load diagnostics. The open load detect current sink can be
disabled via the SPI to allow the outputs to be used as LED drivers. The ROUTx outputs can also be PWM’d via the SPI for use
as variable speed motor drivers, LED/lamp dimming drivers, or as a fuel pump driver (ROUT1). All control and configuration for
the ROUT’s is via the SPI ROUT1 and ROUT2 ON/OFF word in the SPI Control register and the individual ROUT1 and ROUT2
words in the SPI Control register.
The ROUT2 relay output can be configured in SPI to drive a power relay controlled by the BATSW signal.
5.1.21 LAMPOUT Driver Output
The Lamp driver output, LAMPOUT is a low side driver capable of driving an incandescent lamp. The current limit contains a
programmable delay to allow the driver to handle the inrush current of a cold lamp filament. A pull-down current sink is provided
to allow the IC to detect when the bulb is burned out (open filament). The turn on and off of the LAMP is via the SPI ON/OFF
control register word and it also has the ability to be PWM’d for advanced diagnostic (dimming) purposes via the SPI Lamp
Control register. The output can also be used to drive a LED if the open load detect current sink is commanded off via the SPI,
to prevent “ghosting”. The LAMPOUT SPI configuration register contains the following bits.
Analog Integrated Circuit Device Data
Freescale Semiconductor
33813
28