Rainbow Electronics MAX5970 - Manual (Page 20)

0V to 16V, Dual Hot-Swap Controller with 10-Bit
Current and Voltage Monitor and 4 LED Drivers
MAX5970
20 _____________________________________________________________________________________
Digital Current Monitoring
The two current-sense signals are sampled by the inter-
nal 10-bit 10ksps ADC, and the most recent results are
stored in registers for retrieval through the I
2 C interface.
The current conversion values are 10 bits wide, with the
eight high-order bits written to one 8-bit register and the
two low-order bits written to the next higher 8-bit register
address (Tables 9 and 10). This allows use of just the
high-order byte in applications where 10-bit precision is
not required. This split 8-bit/2-bit storage scheme is used
throughout the MAX5970 for all 10-bit ADC conversion
results and 10-bit digital comparator thresholds.
Table 8. dac_chx Register Format
Table 9. ADC Current Conversion Results Register Format (High-Order Bits)
Table 10. ADC Current Conversion Results Register Format (Low-Order Bits)
Description: Fast-comparator threshold DAC setting
Register Title: dac_ch0 dac_ch1
Register Addresses: 0x2E 0x2F
R/W R/W R/W R/W R/W R/W R/W R/W
RESET
VALUE
DAC[7] DAC[6] DAC[5] DAC[4] DAC[3] DAC[2] DAC[1] DAC[0] 0xBF
bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0
Description: Most recent current conversion result, high-order bits [9:2]
Register Title: adc_ch0_cs_msb adc_ch1_cs_msb
Register Addresses: 0x00 0x04
R R R R R R R R
RESET
VALUE
inew_9 inew_8 inew_7 inew_6 inew_5 inew_4 inew_3 inew_2 0x00
bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0
Description: Most recent current conversion result, low-order bits [0:1]
Register Title: adc_ch0_cs_ lsb adc_ch1_cs_lsb
Register Addresses: 0x01 0x05
R R R R R R R R
RESET
VALUE
inew_1 inew_0 0x00
bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0