max5978 Maxim Integrated Products, Inc., max5978 Datasheet - Page 22

• Manufacturer Part Number: max5978
• Description: 0 To 16v, Hot-swap Controller With 10-bit Current, Voltage Monitor, And 4 Led Drivers
• Manufacturer: Maxim Integrated Products, Inc.

0 to 16V, Hot-Swap Controller with 10-Bit
Current, Voltage Monitor, and 4 LED Drivers
The voltage at the load (MON input) is sampled by the
internal ADC. The MON full-scale voltage can be set to
16V, 8V, 4V, or 2V by writing to register mon_range. The
default range is 16V (Tables 16 and 17).
The most recent voltage-conversion results can be read
from the adc_mon_msb and adc_mon_lsb registers (see
Tables 18 and 19).
Table 16. ADC Voltage Monitor Settings Register Format
Table 17. ADC Full-Scale Voltage Setting
Table 18. ADC Voltage-Conversion Result Register Format (High-Order Bits)
Table 19. ADC Voltage-Conversion Result Register Format (Low-Order Bits)
22
Digital Voltage Monitoring and Power-Good
Description:
Register Title:
Register Addresses:
Description:
Register Title:
Register Addresses:
Description:
Register Title:
Register Addresses:
vnew_9
Bit 7
R/W
Bit 7
Bit 7
—
—
R
R
MON_rng1
0
0
1
1
vnew_8
R/W
Bit 6
Bit 6
Bit 6
—
—
R
R
ADC voltage monitor full-scale range settings (for MON input)
mon_range
0x18
Most recent voltage-conversion result, high-order bits [9:2]
adc_mon_msb
0x02
Most recent voltage-conversion result, low-order bits [1:0]
adc_mon_lsb
0x03
vnew_7
Bit 5
R/W
Bit 5
Bit 5
—
—
R
R
vnew_6
R/W
Bit 4
Bit 4
Bit 4
—
R
—
R
MON_rng0
Output
0
1
0
1
Unused
vnew_5
Bit 3
Bit 3
R/W
Bit 3
R
—
R
The most recent voltage values are continuously com-
pared to four programmable limits, comprising two
undervoltage (UV) levels (see Tables 20 to 23) and two
overvoltage (OV) levels (see Tables 24 to 27).
If PG is asserted and the voltage is outside the warning
limits, the ALERT output is asserted low. Depending on
the status of the prot[] bits in register status1[7:6], the
Digital Undervoltage- and Overvoltage-
vnew_4
Unused
Bit 2
Bit 2
R/W
Bit 2
R
—
R
ADC FULL-SCALE VOLTAGE (V)
MON_rng1
vnew_3
vnew_1
Bit 1
Bit 1
R
R/W
Bit 1
R
Detection Thresholds
16
8
4
2
vnew_2
MON_rng0
vnew_0
Bit 0
Bit 0
R
Bit 0
R/W
R
RESET
VALUE
VALUE
RESET
VALUE
RESET
0x00
0x00
0x00
—
—
—