Rainbow-electronics MAX5970 Manual do Utilizador descarregar pdf (Página 31)

0V to 16V, Dual Hot-Swap Controller with 10-Bit

Current and Voltage Monitor and 4 LED Drivers

MAX5970

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Table 41. Circular Buffer Read Addresses

Table 42. Circular Buffer Control Register Format

Table 43. Circular Buffer Resolution Register Format

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

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.

• Clearing appropriate bits in register cbuf_chx_store.

• A read of the circular buffer base address is per-

formed through the I

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

C interface

at four fixed addresses in the MAX5970 register address

space (see Table 41).

Each of the four buffers can also be stopped under user

control by register cbuf_chx_store (see Table 42).

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).

ADDRESS NAME DESCRIPTION

0x46 cbuf_ba_ch0_v Base address for channel 0 voltage buffer block read

0x47 cbuf_ba_ch0_i Base address for channel 0 current buffer block read

0x48 cbuf_ba_ch1_v Base address for channel 1 voltage buffer block read

0x49 cbuf_ba_ch_i Base address for channel 1 current buffer block read

Description: Circular buffer run-stop control register (per-buffer control: 1 = run, 0 = stop)

R R R R R/W R/W R/W R/W

RESET

VALUE

— — — — Ch1_i_run Ch1_v_run Ch0_i_run Ch0_v_run 0x0F

bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0

Description:

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)

R R R R R/W R/W R/W R/W

RESET

VALUE

— — — — Ch1_i_res Ch1_v_res Ch0_i_res Ch0_v_res 0x0F

bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0

1 2 ... 26 27 28 29 30 31 32 33 34 35 36 ... 40 41

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