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0V to 16V, Dual Hot-Swap Controller with 10-Bit
Current and Voltage Monitor and 4 LED Drivers
Circular Buffer
The MAX5970 features four 10-bit “circular buffers” (in
volatile memory) that contain a history of the 50 most-
recent voltage and current digital conversion results for
each hot-swap channel. These circular buffers can be
read back through the I 2 C interface. The recording of
new data to the buffer for a given signal is stopped under
any of the following conditions:
? The corresponding channel is shut down because of
a fault condition.
Table 41. Circular Buffer Read Addresses
? Clearing appropriate bits in register cbuf_chx_store.
? A read of the circular buffer base address is per -
formed through the I 2 C interface.
? The corresponding channel is turned off by a combi -
nation of the Chx_EN1, Chx_EN2, or ON_ signals.
The buffers allow the user to recall the voltage and cur-
rent waveforms for analysis and troubleshooting. The
buffer contents are accessed through the I 2 C interface
at four fixed addresses in the MAX5970 register address
space (see Table 41).
ADDRESS
0x46
0x47
0x48
0x49
NAME
cbuf_ba_ch0_v
cbuf_ba_ch0_i
cbuf_ba_ch1_v
cbuf_ba_ch_i
DESCRIPTION
Base address for channel 0 voltage buffer block read
Base address for channel 0 current buffer block read
Base address for channel 1 voltage buffer block read
Base address for channel 1 current buffer block read
Each of the four buffers can also be stopped under user
control by register cbuf_chx_store (see Table 42).
Table 42. Circular Buffer Control Register Format
Description:
Register Title:
Register Address:
Circular buffer run-stop control register (per-buffer control: 1 = run, 0 = stop)
cbuf_chx_store
0x19
R
—
bit 7
R
—
bit 6
R
—
bit 5
R
—
bit 4
R/W
Ch1_i_run
bit 3
R/W
Ch1_v_run
bit 2
R/W
Ch0_i_run
bit 1
R/W
Ch0_v_run
bit 0
RESET
VALUE
0x0F
The contents of a buffer can be retrieved as a block read
of either fifty 10-bit values (spanning 2 bytes each) or of
fifty high-order bytes, depending on the per-signal bit
settings of register cbufrd_hibyonly (see Table 43).
Table 43. Circular Buffer Resolution Register Format
Description:
Register Title:
Register Address:
Circular buffer read-out resolution: high-order byte only, or 8-2 split 10-bit data
(per-buffer control: 1 = high-order byte output, 0 = full-resolution 10-bit output)
cbufrd_hibyonly
0x3F
R
—
bit 7
R
—
bit 6
R
—
bit 5
R
—
bit 4
R/W
Ch1_i_res
bit 3
R/W
Ch1_v_res
bit 2
R/W
Ch0_i_res
bit 1
R/W
Ch0_v_res
bit 0
RESET
VALUE
0x0F
______________________________________________________________________________________
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