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0V to 16V, Dual Hot-Swap Controller with 10-Bit
Current and Voltage Monitor and 4 LED Drivers
Once the PG_ output is asserted, the most recent cur-
rent samples are continuously compared to the pro-
grammable overcurrent warning register values. If the
measured current value exceeds the warning level, the
ALERT output is asserted. The MAX5970 response to
this digital comparator is not altered by the setting of the
PROT input (Tables 11 and 12).
Minimum and Maximum Value
Detection for Current Measurement Values
All current measurement values from the ADC are
and maximum-value registers, and if the most recent
measurement exceeds the stored maximum or is less
than the stored minimum, the corresponding register
is updated with the new value. These peak detection
registers are read accessible through the I 2 C interface
(Tables 13–16). The minimum-value registers are reset
to 0x3FF, and the maximum-value registers are reset
to 0x000. These reset values are loaded upon startup
of a channel or at any time as commanded by register
peak_log_rst (Table 36).
continuously compared with the contents of minimum-
Table 11. Overcurrent Warning Threshold Register Format (High-Order Bits)
Description:
Overcurrent warning threshold high-order bits [9:2]
Register Title:
Register Addresses:
oi_ch0_msb
0x22
oi_ch1_msb
0x2C
R/W
oi_9
bit 7
R/W
oi_8
bit 6
R/W
oi_7
bit 5
R/W
oi_6
bit 4
R/W
oi_5
bit 3
R/W
oi_4
bit 2
R/W
oi_3
bit 1
R/W
oi_2
bit 0
RESET
VALUE
0xFF
Table 12. Overcurrent Warning Threshold Register Format (Low-Order Bits)
Description:
Overcurrent warning threshold low-order bits [1:0]
Register Title:
Register Addresses:
oi_ch0_ lsb
0x23
oi_ch1_lsb
0x2D
R
R
R
R
R
R
R/W
R/W
RESET
VALUE
oi_1
oi_0
0x03
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
Table 13. ADC Minimum Current Conversion Register Format (High-Order Bits)
Description:
Minimum current conversion result high-order bits [9:2]
Register Title:
Register Addresses:
min_ch0_cs_msb
0x08
min_ch1_cs_msb
0x10
R
imin_9
bit 7
R
imin_8
bit 6
R
imin_7
bit 5
R
imin_6
bit 4
R
imin_5
bit 3
R
imin_4
bit 2
R
imin_3
bit 1
R
imin_2
bit 0
RESET
VALUE
0xFF
______________________________________________________________________________________
21
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