micrf507ymltr Micrel Semiconductor, micrf507ymltr Datasheet - Page 14

• Manufacturer Part Number: micrf507ymltr
• Description: 470mhz To 510mhz Low-power Fsk Transceiver With +10dbm Power Amplifier
• Manufacturer: Micrel Semiconductor

Control Interface Timing
Figure 4 and Table 2 give the timing specifications for the
control interface.
When in Receive or Transmit mode (but not Power-down
or Standby mode), an additional timing constraint applies:
elapsed time between falling edges of CS must be a
minimum of 2/f
frequency (also called phase detector frequency). f
f
where M = M0 when receiving or transmitting with VCO
modulation, and M = max{M0, M1} when transmitting with
divider modulation.
March 2010
XCO
Micrel, Inc.
Symbol
T
T
t
t
T
T
T
T
t
fall
rise
POR
high
low
csr
csf
write
read
/M,
Parameter
Min. high time of
SCLK
Min. low time of
SCLK
Fall time of SCLK
Rise time of SCLK
Time from rising
edge of CS to
falling edge of
SCLK
Min. delay from
rising edge of CS
to rising edge of
SCLK
Min. delay from
valid IO to falling
edge of SCLK
during a write
operation
Min. delay from
rising edge of
SCLK to valid IO
during a read
operation
(assuming load
capacitance of IO
is 25pF)
Power on Reset
time
Table 1. Control Interface Timing
c
, where f
min
f
c
=
c
time
f
is the synthesizer’s comparison
XCO
M
Min.
=
20
20
50
25
20
75
f
2M
XCO
Values
Typ.
4.6
Max.
1
1
9
Units
ms
ns
ns
µs
µs
ns
ns
ns
ns
c
=
14
Power-on Reset
The power-on reset time (t
as the time from application of supply voltage to
completion of power on reset.
To determine when the chip has completed its power-on
without waiting for the worst-case time (maximum t
the following:
Because registers are initially in an unknown state after
power-on (exception: Mode[1:0] initializes to 00), always
enter a complete set of register values as the first
transaction, and always enter only nonzero values for N
and M.
•
•
Write hex 03 (binary 00000011) to Register 0.
This puts the chip in Standby mode.
Read Register 0. If the value read is binary
00000011, then exit; power-on is complete. If not,
go to previous step and repeat.
Figure 5. Power-On Programming Flowchart
POR
), given in Table 2, is defined
M9999-032210-B
MICRF507
POR
)
, do