908E625_10 Datasheet, PDF (27/49 Pages) Freescale Semiconductor, Inc – Integrated Quad Half H-Bridge with Power Supply, Embedded MCU, and LIN Serial Communication

FUNCTIONAL DEVICE OPERATION
LOGIC COMMANDS AND REGISTERS
POWER OUTPUT REGISTER (POUT)
Register Name and Address: POUT - $0b
Bits 7 6 5
4
3
2
1
0
Read 0
0
CSSEL1 CSSEL0 CSEN
0⁽¹⁶⁾
HVDDON HS_ON
Write
Reset 0 0 0
0
0
0
0
0
Notes
16. This bit must always be set to 0.
Current Source Select Bits (CSSEL0:CSSEL1)
These read/write bits select the current source values.
Reset clears the CSSEL0:CSSEL1 bits.
Current Source Enable Bit (CSEN)
This read/write bit enables the current source for PA1.
Reset clears the CSEN bit (Table 9).
Table 9. PA1 Current Source Enable Bit
CSEN
Current Source Enable
0
Current Source Off
1
Current Source On
HVDD On Bit (HVDDON)
This read/write bit enables HVDD output. Reset clears the
HVDDON bit.
• 1 = HVDD enabled
• 0 = HVDD disabled
Lamp Driver On Bit (HS_ON)
This read/write bit enables the Lamp driver. Reset clears
the HS_ON bit.
• 1 = Lamp driver enabled
• 0 = Lamp driver disabled
Hall-Effect Sensor Input Pins (H1:H3)
Function
The Hall-effect sensor input pins provide three inputs for
two-pin Hall-effect sensors for detecting stall and position or
reading Hall-effect sensor contact switches. The Hall-effect
sensor input pins are not influenced by the PSON bit in the
System Control Register.
Each pin of the Hall-effect sensor can be enabled by
setting the HxEN bit in the Hall-Effect Sensor Input Pin
Control Register (HACTL). If the pins are enabled, the Hall-
effect sensors are supplied with V_SUP voltage and the sense
circuitry is working. An internal clamp circuity limits the supply
voltage to the sensor to 15 V. This sense circuitry monitors
the current to VSS. The result of this sense operation is given
by the HxF flags in the Hall-Effect Sensor Input Pin Status
Register (HASTAT).
The flag is set if the sensed current is higher than I_HSCT.
To prevent noise on this flag, a hysteresis is implemented on
these pins.
After switching on the Hall-effect sensor input pins (HxEN
= 1), the Hall-effect sensors need some time to stabilize the
output. In RUN mode the software must wait at least 40 μs
between enabling the Hall-effect sensor and reading the hall
flag.
The Hall-effect sensor input pin works in an dynamic
output voltage range from V_SUP down to 2.0 V. Below 2.0 V
the hallflags are not functional anymore. If the output voltage
is below a certain threshold, the Hall-Effect Sensor Input Pin
Overcurrent Flag (HP_OCF) in the System Status Register is
set.
Figures 13 through 15 illustrate the connections to the
Hall-effect input sensors.
Analog Integrated Circuit Device Data
Freescale Semiconductor
908E625
27