MIC3003GFL Datasheet, PDF (54/74 Pages) Micrel Semiconductor – FOM Management IC with Internal Calibration

Micrel, Inc.
MIC3003GFL
User Control Register (USRCTL)
D[7]
Reserved
read/write
D[6]
PORM
read/write
D[5]
PORS
read/write
D[4]
IE
read/write
D[3]
APCSEL
read/write
D[2]
APCSEL
read/write
D[1]
APCSEL
read/write
D[0]
MODSEL
read/write
Default value
0010 0000b = 20h
Serial address
A2h
Byte address
254 = FEh
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. Similarly, MODSEL[1:0] select which of MODSET0, MODSET1, or MODSET2 are used to select the
modulation level of the laser.
IE must be set for any host interrupts to occur via the /INT pin. If IE is set while /INT is asserted, /INT will be de-asserted
immediately.
PORS is always set high by any power-on reset event. If PORM is high, the power-on event will also generate a host interrupt.
PORS will be cleared to zero and the interrupt output de-asserted when USRCTL is read by the host.
If PORM is set following the setting of PORS, PORS will remain set, and /INT will be asserted immediately. /INT will not be de-
asserted until USRCTL is read by the host.
PORM, IE, APCSEL, and MODSEL are non-volatile and will be maintained through power and reset cycles.
Bit(s)
D[7]
D[6]
PORM
Function
Reserved
Power-on interrupt mask
D[5]
PORS Power-on interrupt flag
D[4]
D[3:2]
IE
Global interrupt enable
APCSEL Selects APC setpoint register
D[1:0] MODSEL Selects Modulation setpoint register
Operation
Always write as zero; reads undefined.
1 = POR interrupts mask enabled
0 = POR interrupts mask disabled
1 = POR interrupt occurred
0 = No POR interrupt
1 = Host interrupts are enabled
0 = Host interrupts are disabled
00 = APCSET0
01 = APCSET1
10 = APCSET2
11 = Reserved
00 = MODSET0
01 = MODSET1
10 = MODSET2
11 = Reserved
D[7]
reserved
read-only
Default Value
Serial address
Byte address
D[6]
reserved
read-only
D[5]
reserved
read-only
RESETOUT
D[4]
reserved
read-only
D[3]
reserved
read-only
D[2]
RESETOUT
read/write
D[1]
RESETOUT
read/write
0000 0000b = 00h
A2h
255 = FFh
D[0]
RESETOUT
read/write
July 2010
54
M9999-072910-A
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