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Using Alarms on the Honeywell HumidIcon™ Digital
Humidity/Temperature Sensors: HIH-6130/6131 Series
Figure 5. Alarm Outputs with Active High Polarity
Alarm_High Output = 1
Alarm_Low Output = 0
Alarm_High Output = 0
Alarm_Low_Off
Alarm_Low_On
Alarm_Low Output = 1
If the polarity of the Alarm_Low output is changed to Active
Low then the Alarm_Low output will be high when the humidity
is above the humidity value stored in the Alarm_Low_Off
register and low when the humidity is less than humidity value
in the Alarm_Low_On register (see Figure 6).
Figure 6. Alarm Outputs with Active Low Polarity
Alarm_High Output = 1
Alarm_Low Output = 1
Alarm_High Output = 0
Alarm_Low_Off
Alarm_Low_On
Alarm_Low Output = 0
By reversing the polarity of Alarm_Low, its output now behaves
in the same manner as Alarm_High, in other words, as a
second high alarm; however, the effect of the alarm registers
also reverses. The Alarm_Low_On register acts like the
Alarm_High_Off register, while the Alarm_Low_Off register
acts like the Alarm_High_On register.
The same steps can be done to create two low alarms.
Reverse the polarity of Alarm_High and the functions of the
Alarm_High_On and Alarm_High_Off registers will also switch.
Alarm_High_On
Alarm_High_Off
Alarm_High Output = 0
Alarm_Low Output = 0
Time
Alarm_High_On
Alarm_High_Off
Alarm_High Output = 0
Alarm_Low Output = 1
Time
6.0
Disabling Alarms
If an application does not require the use of alarms, then the
alarms may be disabled by setting registers Alarm_High_On
and Alarm_High_Off to their maximum value (0x3FFF) and
registers Alarm_Low_On and Alarm_Low_Off to their minimum
value (0x0000). In this configuration the alarm outputs must be
left unconnected in the application.
7.0
Appendices
7.1
Appendix A. EEPROM Memory Map
Table 2 shows the EEPROM Memory Map.
Table 2. EEPROM Memory Map
EEPROM
Default
Address
0x00 to 0x15
N/A
0x16
0x0000
0x17
0x0000
0x18
0x3FFF
Alarm_High_On high alarm on trip
0x19
0x3FFF
Alarm_High_Off high alarm off trip
0x1A
0x0000
0x1B
0x0000
0x1C
0x0027
0x1D
0x0000
0x1E
0xYYYY
(Y=data)
0x1F
0xYYYY
(Y=data)
7.2
Appendix B. Customer Configuration Register
The Customer Configuration Register (see Table 3) is located
at EEPROM address 0x1C. It can only be accessed using
Command Mode.
Honeywell Sensing and Control 3
Name
Description
do not change;
reserved
must be left at
factory settings;
locked EEPROM
locations
do not change;
reserved
must be left at
factory settings
reserved
do not change;
must be left at
factory settings
point
point
Alarm_Low_On low alarm on trip
point
Alarm_Low_Off low alarm off trip
point
Cust_Config
Customer
Configuration
Register (see
Section 4.0)
reserved
do not change;
must be left at
factory settings
Cust_ID2
customer ID word;
for use by customer
Cust_ID3
customer ID word;
for use by customer
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