MAX11014_08 Datasheet, PDF (33/70 Pages) Maxim Integrated Products – Automatic RF MESFET Amplifier Drain-Current Controllers

Automatic RF MESFET Amplifier
Drain-Current Controllers
Table 3. TH1 and TH2 (Read/Write)
BIT
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
RESET
STATE
X
X
X
X
0
1
1
1
1
1
1
1
1
1
1
1
BIT VALUE
(°C)
X
X
X
X
MSB
(sign)
128
64
32
16
8
4
2
1
0.5
0.25
LSB
0.125
X = Don’t care.
Table 4. High/Low Temperature ALARM Threshold Examples
TEMPERATURE
SETTING
-40°C
-1.625°C
0°C
+27.125°C
+105°C
DATA BITS D11–D0
(TWO’S COMPLEMENT)
1110 1100 0000
1111 1111 0011
0000 0000 0000
0000 1101 1001
0011 0100 1000
Table 5. TL1 and TL2 (Read/Write)
BIT
RESET
STATE
D15 D14 D13 D12 D11 D10 D9
X
X
X
X
1
0
0
BIT VALUE
(°C)
X
X
X
X
MSB
(sign)
128
64
X = Don’t care.
change to normal power mode, write two commands to
the shutdown register. Set the FULLPD bit to 0 (other
bits in the shutdown register are ignored) on the first
command. A second command to this register acti-
vates the internal blocks.
TH1 and TH2 (Read/Write)
Set the external channel 1 and channel 2 high tempera-
ture ALARM thresholds by writing command bytes 20h
and 2Ch, respectively. Following the command byte,
write 12 bits of data to bits D11–D0. Read the high tem-
perature channel 1 and channel 2 ALARM thresholds
by writing command bytes A0h and ACh, respectively.
Following the command byte, read 12 bits of data from
bits D11–D0. Bits D15–D12 are don’t care. Temper-
ature data must be written and read in two’s-comple-
ment format, with the LSB corresponding to +0.125°C.
See Table 3. The POR value of the high temperature
ALARM threshold registers is 0111 1111 1111, which
corresponds to +255.875°C. See Table 4 for examples
of channel 1/channel 2 high and low temperature
threshold settings. See Figures 25 and 27 for ALARM
examples.
D8 D7 D6 D5 D4 D3 D2 D1 D0
0
0
0
0
0
0
0
0
0
32 16 8
4
2
1
0.5
0.25
LSB
0.125
TL1 and TL2 (Read/Write)
Set the external channel 1 and channel 2 low tempera-
ture ALARM thresholds by writing command bytes 22h
and 2Eh, respectively. Following the command byte,
write 12 bits of data to bits D11–D0. Read the low tem-
perature channel 1 and channel 2 ALARM thresholds
by writing command bytes A2h and AEh, respectively.
Following the command byte, read 12 bits of data from
bits D11–D0. Bits D15–D12 are don’t care. Temper-
ature data must be written and read in two’s-comple-
ment format, with the LSB corresponding to +0.125°C.
See Table 5. The POR value of the low temperature
ALARM threshold registers is 1000 0000 0000, which
corresponds to -256.0°C. See Figures 25 and 27 for
ALARM examples.
IH1 and IH2 (Read/Write)
Set the channel 1 and channel 2 high sense voltage
ALARM thresholds by writing command bytes 24h and
30h, respectively. Following the command byte, write
12 bits of data to bits D11–D0. Read the high sense
voltage channel 1 and channel 2 ALARM thresholds by
writing command bytes A4h and B0h, respectively.
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