Rainbow-electronics MAX6871 Manual do Utilizador Página 44
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MAX6870/MAX6871
and WDI_ bits assert if any of the GPI_ inputs are config-
ured as watchdog inputs (WDI_) and a watchdog fault
occurs.
Configuration Lock
Lock the configuration register bank and configuration
EEPROM contents after initial programming by setting
the lock bit high (see Table 30). Locking the configura-
tion prevents write operations to all registers except the
configuration lock register. Clear the lock bit to recon-
figure the device.
Write Disable
A unique write disable feature protects the MAX6870/
MAX6871 from inadvertent user EEPROM writes. As
input voltages that power the serial interface, a µP, or any
other writing devices fall, unintentional data may be writ-
ten onto the data bus. The user EEPROM write disable
function (see Table 31) ensures that unintentional data
does not corrupt the MAX6870/MAX6871 EEPROM data.
EEPROM-Programmable Hex/Quad
Power-Supply Sequencers/Supervisors with ADC
44 ______________________________________________________________________________________
Table 29. Fault Registers (60h–62h)
REGISTER
ADDRESS
BIT
RANGE
DESCRIPTION
[0] 1 = IN1 falls below primary undervoltage threshold.
[1] 1 = IN2 falls below primary undervoltage threshold.
[2] 1 = IN3 falls below primary undervoltage threshold.
[3] 1 = IN4 falls below primary undervoltage threshold.
[4] 1 = IN5 (MAX6870 only) falls below primary undervoltage threshold.
[5] 1 = IN6 (MAX6870 only) falls below primary undervoltage threshold.
60h
[7:6] Not used.
[0]
1 = IN1 falls below secondary undervoltage threshold or rises above secondary overvoltage threshold,
depending on the settings in register 0Ch (see Tables 2, 3, and 4).
[1]
1 = IN2 falls below secondary undervoltage threshold or rises above secondary overvoltage threshold,
depending on the settings in register 0Ch (see Tables 2, 3, and 4).
[2]
1 = IN3 falls below secondary undervoltage threshold or rises above secondary overvoltage threshold,
depending on the settings in register 0Ch (see Tables 2, 3, and 4).
[3]
1 = IN4 falls below secondary undervoltage threshold or rises above secondary overvoltage threshold,
depending on the settings in register 0Ch (see Tables 2, 3, and 4).
[4]
1 = IN5 (MAX6870 only) falls below secondary undervoltage threshold or rises above secondary
overvoltage threshold, depending on the settings in register 0Ch (see Tables 2, 3, and 4).
[5]
1 = IN6 (MAX6870 only) falls below secondary undervoltage threshold or rises above secondary
overvoltage threshold, depending on the settings in register 0Ch (see Tables 2, 3, and 4).
61h
[7:6] Not used.
[0] 1 = WDI1 asserted.
[1] 1 = WDI2 asserted.
[2] 1 = GPI1 asserted.
[3] 1 = GPI2 asserted.
[4] 1 = GPI3 asserted.
[5] 1 = GPI4 asserted.
[6] 1 = MR asserted.
62h
[7] Not used.
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