RE46C180S16TF【PDF 22/58 页】IC ION SMOKE DETECT ASIC 16SOIC

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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

DETECT = V

2. Drive T2 input from V

to V

and hold at V

to enter TM0.

3. Drive TEST from V

to V

and hold at V

4. Apply 10 clock pulses to the T2 input (V

and back to V

) to enter in TM10 mode.

This enables the Serial Read/Write Calibration

mode.

5. TEST now acts as a data input (High = V

Low = V

). FEED acts as the clock input

(High = V

, Low = V

). 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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