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1) Different make and model may be installed on different module variants.
RTC - Real Time Clock
An temperature Temperature compensated Intersil ISL12020M IC is used for Real Time Clock (U20). Battery voltage must be supplied to the module VBAT_IN pin from the baseboard to use battery backed functionality. Battery backed registers can be accessed over I2C bus at slave address of 0x6F. General purpose RAM is at I2C slave address 0x57. RTC IC is supported by Linux so it can be used as hwclock device.
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NOSEQ input signal from the carrier board can be used to control output of the two DC-DC converters U1 and U3. It works in conjunction with the System Controller CPLD firmware controlled ON_1V0 and ON_1V8 input signals of the U21 and U25 gate ICs.
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| If NOSEQ input signal from the carrier board is low (logical 0), signals ON_1V0 and ON_1V8 can be driven by System Controller CPLD to control outputs of the U1 and U3 DC-DC converters. | If NOSEQ input signal from the carrier board is high (logical 1), state of the ON_1V0 and ON_1V8 signals is irrelevant and DC-DC converters U1 and U3 outputs are always enabled. |
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