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| 型号： | RE46C180S16TF |
| 厂商： | Microchip Technology |
| 文件页数： | 30/58页 |
| 文件大小： | 851K |
| 描述： | IC ION SMOKE DETECT ASIC 16SOIC |
| 标准包装： | 2,600 |
| 系列： | * |
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RE46C180
DS22275A-page 30
?2011 Microchip Technology Inc.
4.6
Serial Read/Write Calibration and
User Features
As an alternative to the steps in Section 4.2, Smoke
Calibration and Section 4.4, User Feature Selec-
tions, the sensitivity settings and user feature selec-
tions can be entered directly from a Serial Read/Write
Calibration mode.
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 18 clock pulses to the T2 input (V
DD
to
V
SS
and then back to V
DD
) to enter in TM18
mode. This enables the Serial Read/Write
Calibration and User Features modes.
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 35 bits have been entered, pulse IO to
store into the EEPROM memory.
D1 ~ D18
User Features (18 bits, LSB first)
D19 ~ D35
Calibration (17 bits, LSB First)
REGISTER 4-3:
SERIAL READ/WRITE REGISTER
W-x
W-x
W-x
PTTR5
PTTR4
PTTR3
bit 35
bit 33
W-x
W-x
W-x
W-x
W-x
W-x
W-x
W-x
PTTR2
PTTR1
TMTR4
TMTR3
TMTR2
TMTR1
HYTR3
HYTR2
bit 32
bit 25
W-x
W-x
W-x
W-x
W-x
W-x
U
W-x
HYTR1
STTR5
STTR4
STTR3
STTR2
STTR1
LBTR2
bit 24
bit 17
W-x
W-x
W-x
W-x
W-x
W-x
W-x
W-x
LBTR1
EOLEn
COEn
NoAAL
SyncEn
LBHshEn
AMHCEn
AMLEDEn
bit 16
bit 8
W-x
W-x
W-x
W-x
W-x
W-x
W-x
W-x
AMTO2
AMTO1
AMEn
ShrTO
SmrtH
HIAO
HushEnB
TSEL
bit 8
bit 1
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as 0
-n = Value at POR
1 = Bit is set
0 = Bit is cleared
x = Bit is unknown
bit 35
PTTR5: MSB (See Table 4-5)
bit 34
PTTR4: 4SB
bit 33
PTTR3: 3SB
bit 32
PTTR2: 2SB
bit 31
PTTR1: LSB
bit 30
TMTR4: MSB (See Table 4-4)
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