MIC3001 Datasheet, PDF (54/74 Pages) Micrel Semiconductor – SFP Management IC with Internal Calibration

MIC3001
Micrel
Data Ready Flags (DATARDY)
D[7]
TRDY
read only
D[6]
VRDY
read only
D[5]
IRDY
read only
D[4]
TXRDY
read only
D[3]
RXRDY
read only
D[2]
reserved
D[1]
reserved
D[0]
reserved
Default Value
0000 0000_b = 00_h
Serial Address
A2_h = 1010001_b
Byte Address
254 = FE_h
When the A/D conversion for a given parameter is completed and the results available to the host, the corresponding
data ready flag will be set. The flag will be cleared when the host reads the corresponding result register.
Bit(s)
D[7]
TRDY
D[6]
VRDY
D[5]
IRDY
D[4]
TXRDY
D[3]
RXRDY
D[2:0]
Function
Temperature data ready flag
Voltage data ready flag
Bias current data ready flag
Transmit power data ready flag
Receive power data ready flag
Reserved
Operation
0 = old data; 1 = new data ready
0 = old data; 1 = new data ready
0 = old data; 1 = new data ready
0 = old data; 1 = new data ready
0 = old data; 1 = new data ready
Reserved
USER Control Register (USRCTL)
D[7]
reserved
D[6]
PORM
read/write
D[5]
PORS
read only
D[4]
IE
read/write
D[3]
APCSEL
read/write
D[2]
read/write
D[1]
reserved
D[0]
reserved
Default Value
0010 0000_b = 20_h
Serial Address
A2_h = 1010001_b
Byte Address
255 = FF_h
This register provides for control of the nominal APC setpoint and management of interrupts by the end-user.
APCSEL[1:0] select which of the APC setpoint registers, APCSET0, APCSET1, or APCSET2 are used as the nominal
automatic power control setpoint.
IE must be set for any interrupts to occur. If PORM is set, the power-on event will generate an interrupt and warm
resets using RST will not generate a POR interrupt. When a power-on interrupt occurs, assuming PORM=1, PORS will
be set. PORS will be cleared and the interrupt output de-asserted when USRCTL is read by the host. If IE is set while /
INT is asserted, /INT will be de-asserted. The host must still clear the various status flags by reading them. If PORM is
set following the setting of PORS, PORS will remain set, and /INT will not be de-asserted, until USRCTL is read by the
host.
PORM, IE, and APCSEL are non-volatile and will be maintained through power and reset cycles. A valid USER
password is required for access to this register.
Bit
D[7]
D[6]
PORM
Function
Reserved
Power-on interrupt mask
D[5]
PORS
Power-on interrupt flag
D[4]
D[3:2]
IE
APCSEL
Global interrupt enable
Selects APC setpoint register
D[1:0]
Reserved
Operation
Always write as zero; reads undefined.
1 = POR interrupts enabled; 0 = disabled; read/write;
non-volatile.
1 = POR interrupt occurred; 0 = no POR interrupt;
read-only.
1 = enabled; 0 = disabled; read/write; non-volatile.
00 = APCSET0, 01 = APCSET1, 10 = APCSET2;
11 = reserved; read/write; non-volatile.
Always write as zero; reads undefined.
M9999-082404
54
August 2004