mm908e622 Freescale Semiconductor, Inc, mm908e622 Datasheet - Page 43

• Manufacturer Part Number: mm908e622
• Description: Mm908e622 Integrated Quad Half-bridge, Triple High-side And Ec Glass Driver With Embedded Mcu And Lin For High End Mirror
• Manufacturer: Freescale Semiconductor, Inc

Electrochrome Circuitry
switching on/off the EC glass and T2 is controlling the EC
output voltage given by the 6Bit DA Converter.
EC Open Load Detection
current source is sourcing a current of typical 200uA on the
EC terminal and the voltage on the terminal is measured. In
case the voltage is above typical 2V (typical 10K threshold)
the ECOLF bit in the EC Status and Control Register
ECSCTL is set indicating the open load condition.
glass is disabled.
EC Short Circuit Protection
case of an short circuit the ECOCF in the EC Status and
Control Register (ECSCTL) is set and the EC circuitry is
disabled.
of an short circuit the ECOCF in the EC Status and Control
Register (ECSCTL) is set and the EC circuitry is disabled.
Analog Integrated Circuit Device Data
Freescale Semiconductor
The EC glass is controlled by two transistors. T1 is
Open Load can be detected by setting ECOLT. A small
If the Open load circuitry is activated (ECOLT=1) the EC
The EC output is protected against shorts to VSUP. In
The EC output is protected against shorts to GND. In case
DAC
6Bit
Figure 25. EC Circuitry
EC output voltage
Control
ECRON
ECOCF
ECOCF
ECON
ECOL
EC Digital to Analog Converter
is controlled. The EC glass circuitry has a 6 bit D/A converter
to control the output voltage between 0 and 1,4V.
EC D/A Converter Control Register (ECDACC)
ECDAx — Digital to Analog Bits
terminal.
Reset
Read
Write
The EC output and therefore the voltage on the EC glass
These read/write bits set the output voltage on the EC
Bit7
Register Name and Address: ECDACC - $06
0
0
On/Off
On/Off
6
0
0
ECDA5
5
0
T1
T2
ECDA4
4
0
Functional Device Operation
ECDA3
3
0
VSUP
GND
ECR
ECDA2
EC
Operational Modes
2
0
ECDA1
1
0
908E622
ECDA0
Bit0
0
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