LTC2970-1 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC2970-1' PDF : 36 Pages View PDF
U
OPERATIO
Table 7. LTC2970 ADC Conversion and Fault Limit Registers
INPUT CHANNEL
ADC_MON()
CONTROL BIT
ADC RESULT REGISTER
(2s COMPLEMENT)
TEMPERATURE
Adc_mon_temp
Temp_adc[14:0]
VIN1_BP-VIN1_BM
Adc_mon_b_ch1
Ch1_b_adc[14:0]
VIN1_AP-VIN1_AM
Adc_mon_a_ch1
Ch1_a_adc[14:0]
VIN0_BP-VIN0_BM
Adc_mon_b_ch0
Ch0_b_adc[14:0]
VIN0_AP-VIN0_AM
Adc_mon_a_ch0
Ch0_a_adc[14:0]
12VIN
Adc_mon_v12
V12_adc[14:0]
VDD
Adc_mon_vdd
Vdd_adc[14:0]
LTC2970/LTC2970-1
OV FAULT REGISTER
(2s COMPLEMENT)
-
Ch1_b_ov[14:0]
Ch1_a_ov[14:0]
Ch0_b_ov[14:0]
Ch0_a_ov[14:0]
V12_ov[14:0]
Vdd_ov[14:0]
UV FAULT REGISTER
(2s COMPLEMENT)
-
Ch1_b_uv[14:0]
Ch1_a_uv[14:0]
Ch0_b_uv[14:0]
Ch0_a_uv[14:0]
V12_uv[14:0]
Vdd_uv[14:0]
reset each time the result register is read. This provides a
simple mechanism for supervisory software to determine
if a new conversion has been completed since data was
last read.
Rules:
The LTC2970 assigns priority to ADC conversions of
CH1_A_ADC and CH0_A_ADC when these channels are
in their initial fast servo mode.
The IO() register control bit Io_i2c_adc_wen must be low
in order for ADC conversions to be performed.
LTC2970-1 Only: ADC conversions are suspended during
any pending tracking requests.
16. Generating and Monitoring Instantaneous Faults
The LTC2970 supports fourteen different types of instan-
taneous faults. These faults together with the conditions
that trigger them are defined in Table 8. There are six
under-voltage faults, six over-voltage faults and two IDAC
limit faults. The FAULT() command may be used to read
the status of all instantaneous fault bits. The IO() com-
mand may be used to configure GPIO_0 and GPIO_1 to
view voltage limit and IDAC faults respectively. The state
of GPIO_0 and GPIO_1 may be read using IO().
Table 8. LTC2970 Fault Reporting Bits and Conditions
CONDITION THAT GENERATES AN
INSTANTANEOUS FAULT
FAULT()
FAULT_EN()
FAULT_LA()
INSTANTANEOUS FAULT REPORTING ENABLE FOR LATCHED FAULT REPORTING LATCHED FAULT REPORTING
V12_adc[14:0] < V12_uv[14:0]
Fault_v12_uv
Fault_en_v12_uv
Fault_la_v12_uv
V12_adc[14:0] > V12_ov[14:0]
Fault_v12_ov
Fault_en_v12_ov
Fault_la_v12_ov
Vdd_adc[14:0] < Vdd_uv[14:0]
Fault_vdd_uv
Fault_en_vdd_uv
Fault_la_vdd_uv
Vdd_adc[14:0] > Vdd_ov[14:0]
Fault_vdd_ov
Fault_en_vdd_ov
Fault_la_vdd_ov
Ch1_b_adc[14:0] < Ch1_b_uv[14:0]
Fault_ch1_b_uv
Fault_en_ch1_b_uv
Fault_la_ch1_b_uv
Ch1_b_adc[14:0] > Ch1_b_ov[14:0]
Fault_ch1_b_ov
Fault_en_ch1_b_ov
Fault_la_ch1_b_ov
Idac_a_ch1[7:0] = 8’ff or 8’h00
Fault_ch1_a_idac
Fault_en_ch1_a_idac
Fault_la_ch1_a_idac
Ch1_a_adc[14:0] < Ch1_a_uv[14:0]
Fault_ch1_a_uv
Fault_en_ch1_a_uv
Fault_la_ch1_a_uv
Ch1_a_adc[14:0] > Ch1_a_ov[14:0]
Fault_ch1_a_ov
Fault_en_ch1_a_ov
Fault_la_ch1_a_ov
Ch0_b_adc[14:0] < Ch0_b_uv[14:0]
Fault_ch0_b_uv
Fault_en_ch0_b_uv
Fault_la_ch0_b_uv
Ch0_b_adc[14:0] > Ch0_b_ov[14:0]
Fault_ch0_b_ov
Fault_en_ch0_b_ov
Fault_la_ch0_b_ov
Idac_a_ch0[7:0] = 8’ff or 8’h00
Fault_ch0_a_idac
Fault_en_ch0_a_idac
Fault_la_ch0_a_idac
Ch0_a_adc[14:0] < Ch0_a_uv[14:0]
Fault_ch0_a_uv
Fault_en_ch0_a_uv
Fault_la_ch0_a_uv
Ch0_a_adc[14:0] > Ch0_a_ov[14:0]
Fault_ch0_a_ov
Fault_en_ch0_a_ov
Fault_la_ch0_a_ov
29701fc
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