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RE46C180 bảng dữ liệu(PDF) 22 Page - Microchip Technology

tên linh kiện RE46C180
Giải thích chi tiết về linh kiện  CMOS Programmable Ionization Smoke Detector ASIC with Interconnect, Timer Mode and Alarm Memory
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RE46C180
DS20002275C-page 22
2011-2021 Microchip Technology Inc.
4.3
Serial Read/Write Calibration
As an alternative to the steps in
Section 4.2, Smoke
Calibration, the sensitivity settings can be entered
directly from a Serial Read/Write Calibration mode (if
the system has been well characterized).
To enter this mode, follow these steps:
1. Power-up with the bias condition shown in
Figure 4-1 to enter M0. At power-up:
TEST = IO = FEED = T2 = VSS,
DETECT = VDD,
2. Drive T2 input from VSS to VDD and hold at VDD
to enter TM0.
3. Drive TEST from VSS to VDD and hold at VDD.
4. Apply 10 clock pulses to the T2 input (VDD to
VSS and back to VDD) to enter in TM10 mode.
This enables the Serial Read/Write Calibration
mode.
5. TEST now acts as a data input (High = VDD,
Low = VSS). FEED acts as the clock input
(High = VDD, Low = VSS). Clock in the sensitivity
settings.
The data sequence should be as follows:
6. After all 17 bits have been entered, pulse IO to
store into the EEPROM memory. Power-down
the part to take effect.
5 bit
Standby Sensitivity (LSB first)
3 bit
Hysteresis (LSB first)
4 bit
HUSH Sensitivity (LSB first)
5 bit
CHAMBER voltage in PTT/Chamber
Test (LSB first)



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