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MCP9800/1/2/3
5.3.4.6
Fault Queue
5.4
Summary of Power-up Condition
The fault queue feature can be used as a filter to lessen
the probability of spurious activation of the ALERT pin.
T A must remain above T SET for the consecutive
number of conversion cycles selected using the Fault
Queue bits. Bit 3 and bit 4 of CONFIG can be used to
select up to six fault queue cycles. For example, if six
The MCP9800/1/2/3 has an internal Power-on Reset
(POR) circuit. If the power supply voltage V DD glitches
down to the 1.7V (typical) threshold, the device resets
the registers to the power-up default settings.
Table 5-4 shows the power-up default summary.
Power-up Defaults
fault queues are selected, T A must be greater than
T SET for six consecutive conversions before ALERT is
asserted as a comparator or an interrupt output.
This queue setting also applies for T HYST . I f six fault
queues are selected, T A must remain below T HYST for
six consecutive conversions before ALERT is
deasserted (Comparator mode) or before another
interrupt is asserted (Interrupt mode).
TABLE 5-4:
Register
T A
T SET
T HYST
Pointer
POWER-UP DEFAULTS
Data
(Hex)
0000 0°C
A000 80°C
9600 75°C
00 Temperature register
5.3.4.7
?? ADC Resolution
Continuous Conversion
The MCP9800/1/2/3 provides access to select the ADC
resolution from 9-bit to 12-bit (0.5°C to 0.0625°C
resolution) using bit 6 and bit 5 of the CONFIG register.
The user can gain better insight into the trends and
CONFIG
00
Comparator mode
Active-low Output
Fault Queue 1
9-bit Resolution
characteristics of the ambient temperature by using a
finer resolution. Increasing the resolution also reduces
the quantization error. Figure 2-3 shows accuracy
versus resolution.
Table 5-3 shows the T A register conversion time for the
corresponding resolution.
At power-up, the MCP9800/1/2/3 has an inherent 2 ms
(typical) power-up delay before updating the registers
with default values and start a conversion cycle. This
delay reduces register corruption due to unsettled
power. After power-up, it takes t CONV for the TCN75A
to update the T A register with valid temperature data.
TABLE 5-3:
RESOLUTION AND
CONVERSION TIME
Bits
9
10
11
12
Resolution
0.5
0.25
0.125
0.0625
t CONV (typical)
30 ms
60 ms
120 ms
240 ms
? 2010 Microchip Technology Inc.
DS21909D-page 25
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