MCP8025 datasheet(39/64 Pages) MICROCHIP

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 2016 Microchip Technology Inc.

DS20005339B-page 39

MCP8025/6

4.5.5

MESSAGES

4.5.5.1

SET_CFG_0

The SET_CFG_0 message is sent by the host to the

MCP8025/6 devices to configure the devices. The

SET_CFG_0

message may be sent to the device at any

time. The host is responsible for making sure the

system is in a state that will not be compromised by

sending the SET_CFG_0 message. The SET_CFG_0

message format is indicated in Table 4-7. The

response is indicated in Table 4-8.

4.5.5.2

GET_CFG_0

The GET_CFG_0 message is sent by the host to the

MCP8025/6

devices

retrieve

the

device

configuration register. The GET_CFG_0 message

format is indicated in Table 4-7. The response is

indicated in Table 4-8.

4.5.5.3

STATUS_0 and STATUS_1

STATUS_0

and STATUS_1 messages are sent by the

host to the MCP8025/6 devices to retrieve the device

STAT0 or STAT1 register. Unsolicited STATUS_0 and

STATUS_1

messages may also be sent to the host by

the MCP8025/6 devices to inform the host of status

changes. The unsolicited STATUS_0 and STATUS_1

messages will only be sent when a status bit changes

to an active state. The STATUS_0 and STATUS_1

message format is indicated in Table 4-7. The

response is indicated in Table 4-8.

When a STATUS_0 and STATUS_1 message is sent to

the host in response to a new fault becoming active, the

fault bit will be cleared either by the host issuing a

STATUS_0

and STATUS_1 request message or by the

host toggling the CE pin low then high. The fault bit will

stay active and not be cleared if the fault condition still

exists at the time the host attempted to clear the fault.

The BORW bit in the STAT1 register will be set every

time the device restarts due to a brown-out event, a

Sleep mode wake-up or a normal power-up. When the

bit is set, a single unsolicited message will be sent to

the host indicating a voltage brownout or power-up has

taken place and that the configuration data may have

been lost. The flag is reset by a ‘STATUS_1 ACK’

(01000110 (46H)) from the device in response to a

Host Status Request command.

4.5.5.4

SET_CFG_1

The SET_CFG_1 message is sent by the host to the

MCP8025/6 devices to configure the motor current limit

reference DAC. The SET_CFG_1 message may be

sent to the device at any time. The host is responsible

for making sure the system is in a state that will not be

compromised by sending the SET_CFG_1 message.

The SET_CFG_1 message format is indicated in

Table 4-7. The response is indicated in Table 4-8.

4.5.5.5

GET_CFG_1

The GET_CFG_1 message is sent by the host to the

MCP8025/6 devices to retrieve the motor current limit

reference DAC configuration register. The GET_CFG_1

message format is indicated in Table 4-7. The

response is indicated in Table 4-8.

4.5.5.6

SET_CFG_2

The SET_CFG_2 message is sent by the host to the

MCP8025/6 devices to configure the driver current limit

blanking time. The SET_CFG_2 message may be sent

to the device at any time. The host is responsible for

making sure the system is in a state that will not be

compromised by sending the SET_CFG_2 message.

The SET_CFG_2 message format is indicated in

Table 4-7. The response is indicated in Table 4-8.

4.5.5.7

GET_CFG_2

The GET_CFG_2 message is sent by the host to the

MCP8025/6

devices

retrieve

the

device

Configuration Register 2. The GET_CFG_2 message

format is indicated in Table 4-7. The response is

indicated in Table 4-8.

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