參數(shù)資料
型號: RE46C180S16TF
廠商: Microchip Technology
文件頁數(shù): 22/58頁
文件大小: 851K
描述: IC ION SMOKE DETECT ASIC 16SOIC
標準包裝: 2,600
系列: *
RE46C180
DS22275A-page 22
?2011 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 = V
SS
,
DETECT = V
DD
,
2.    Drive T2 input from V
SS
 to V
DD
 and hold at V
DD
to enter TM0.
3.    Drive TEST from V
SS
 to V
DD
 and hold at V
DD
.
4.    Apply 10 clock pulses to the T2 input (V
DD
 to
V
SS
 and back to V
DD
) to enter in TM10 mode.
This enables the Serial Read/Write Calibration
mode.
5.    TEST now acts as a data input (High = V
DD
,
Low = V
SS
). FEED acts as the clock input
(High = V
DD
, Low = V
SS
). 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.
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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