908E621_12 Datasheet, PDF (32/60 Pages) Freescale Semiconductor, Inc – Integrated Quad Half bridge and Triple High Side Embedded MCU and LIN for High End Mirror

FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
I_A0(U_A0)
100%
U_A0[V]
4.75 5
To calibrate the current sources, an extra pin (A0CST) is
envisioned. On this pin, an accurate resistor can to be
connected. Switching the current sources to this resistor,
allows the user to measure the current and use the measured
value for calculating the current on A0.
Analog Multiplexer / ADOUT pin
The ADOUT pin is the analog output interface to the
Analog-to-digital converter of the MCU. To be able to have
different sources for the MCU with one single signal, an
analog multiplexer is integrated in the analog die. This
multiplexer has eleven different sources, which can be
selected with the SS[3:0] bits in the A0MUCTL register.
Half-bridge (HB1:HB4) Current Recopy
The multiplexer is connected to the four current sense
circuits on the low side FET of the half bridges. This sense
circuits offers a voltage proportional to the current through the
MOSFET. The resolution is depending on the CSA bit in the
A0 and Multiplexer control register (A0MUCTL).
High Side (HS1:HS3) Current Recopy
The multiplexer is connected to the three high side
switches. This sense circuit offers a voltage proportional to
the current through the transistor.
Analog Input A0 and A0CST
A0 and A0CST are directly connected to the analog
multiplexer. It offers the possibility to read analog values from
the periphery.
Temperature Sensor
The analog die includes an on chip temperature sensor.
This sensor offers a voltage which is proportional to the
actual mean chip junction temperature.
VSUP Prescaler
The VSUP prescaler offers a possibility to measure the
external supply voltage. The output of this voltage is VSUP /
RATIOVSUP.
A0 and Multiplexer Control Register (A0MUCTL)
Register Name and Address: A0MUCTL - $08
Bit7
6
5
4
3
2
1
Bit0
Read
CSON
CSSEL
1
CSSEL
0
CSA
SS3
SS2
SS1
SS0
Write
Reset 0
0
0
0
0
0
0
0
CSON — Current Source on/off
This read/write bit enables the current source for the A0 or
A0CST inputs. Reset clears CSON bit.
1 = Current Source enabled
0 = Current Source disabled
CSSEL[1:0] — Current Source Select Bits
These read/write bits select the current source values for
A0 or A0CST input. Reset clears CSSEL[1:0] bits.
Table 7. A0 Current Source Level Selection Bits
CSSEL1
0
0
1
1
CSSEL0
0
1
0
1
Current Source Enable (typ.)
40 µA
120 µA
320 µA
800 µA
CSA — H-bridges Current Sense Amplification Select Bit
This read/write bit selects the current sense amplification
of the H-Bridges HB1:HB4 current recopy. Reset clears the
CSA bit.
1 = low current sense amplification
0 = high current sense amplification
SS[3:0] — Analog Source Input Select Bits
These read/write bits selects the analog input source for
the ADOUT pin. Reset clears the SS[3:0] bits Analog
Multiplexer Configuration Bits.
SS3 SS2 SS1 SS0
0
0
0
0
0
0
0
1
0
0
1
0
0
0
1
1
0
1
0
0
0
1
0
1
0
1
1
0
0
1
1
1
Channel
current recopy HB1
current recopy HB2
current recopy HB3
current recopy HB4
current recopy HS1
current recopy HS2
current recopy HS3
not used
908E621
32
Analog Integrated Circuit Device Data
Freescale Semiconductor