9TCS1082
MOBILE ACCESS™—CLOCK SYNTHESIZER & TEMPERATURE SENSOR FOR PORTABLE DEVICES
SYNTHESIZERS
Temperature Threshold ALERT# Pin
Temperature Threshold Alerts
The temperature threshold alerts are sent to the ALERT#
pin. To mask this alert being sent to the ALERT# pin, set
register byte[12], bit7 to logic 1. Bit7 corresponds to channel
1.
Through register writes, the high and low temperature limits
can be set such that it will trigger an alert. This alert can be
monitored through the registers or can be sent to the
ALERT# pin. The programmable register to set the
thresholds is as follows:
Consecutive Alerts
(1) High Temperature Alert (default 127°C)
The number of temperature threshold alerts before the
assertion of the ALERT# pin can be set by the user through
register byte[6], bit[3:2] as follows:
Byte[2:0], Bit[7:0]
Temperature
Sign Bit
64°C
Bit[7]
Bit[6]
Bit[5]
Bit[4]
Bit[3]
Bit[2]
Bit[1]
Bit[0]
Byte[6], Bit[3:2]
Number of Alert Events
[00] (default)
[01]
1
2
3
4
32°C
16°C
[10]
8°C
[11]
4°C
2°C
Temperature Threshold Alert Alarm Register
1°C
The temperature channel has a readable register, byte[13],
bit[3:2] that is set when a temperature threshold alert has
occurred.
Where byte[0] is the high temperature alert for DX1.
(2) Low Temperature Alert (default 127°C)
Critical Thermal Warnings
The 9TCS1082 will have register programmable critical
thermal threshold warnings for temperature sensor. Similar
to the temperature threshold alerts, the critical high
temperatures can be set such that a warning can be
dispatched to the THERM# pin and the readable registers.
The thermal warnings also have programmable hysteresis.
Each channel has its own programmable register to set the
thresholds as follows:
Byte[5:3], Bit[7:0]
Temperature
Sign Bit
64°C
Bit[7]
Bit[6]
Bit[5]
Bit[4]
Bit[3]
Bit[2]
Bit[1]
Bit[0]
32°C
16°C
8°C
4°C
(1) Critical Thermal Warning (default 127°C)
2°C
1°C
Byte[9:7], Bit[6:0]
Temperature
64°C
Bit[6]
Bit[5]
Bit[4]
Bit[3]
Bit[2]
Bit[1]
Bit[0]
Where byte[3] is the low alert for DX1.
32°C
Temperature Threshold Alert Status
16°C
When a temperature threshold alert is activated, a status
indicator bit is also set. Register byte[14], bit[6:5] will be set
depending on the high or low alert. Bit[6] is the high and
bit[5] is the low alert flag. To clear the alert, register byte[15],
bit[7] needs to be written with a "1". Writing this bit will also
clear the critical thermal warnings.
8°C
4°C
2°C
1°C
Where byte[7] is the critical thermal warning for DX1.
IDT® MOBILE ACCESS™—CLOCK SYNTHESIZER & TEMPERATURE SENSOR FOR PORTABLE DEVICES
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9TCS1082 REV 0.7 012312
