LH7A404 Sharp Electronics, LH7A404 Datasheet - Page 63

• Manufacturer Part Number: LH7A404
• Manufacturer: Sharp Electronics

Specifications of LH7A404

• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Processing Unit: Microcontroller
• Operating Supply Voltage (min): 1.71V
• Operating Supply Voltage (typ): 1.8V
• Operating Supply Voltage (max): 1.89V
• Package Type: CABGA
• Pin Count: 324
• Mounting: Surface Mount
• Rad Hardened: No
• Lead Free Status / RoHS Status: Not Compliant

32-Bit System-on-Chip
Clock and State Controller
(CSC) Waveforms
coming out of Reset or Power-On. Table 13 gives the
timing parameters.
32.768 kHz oscillator is stable, and must be deasserted
at least two 1 Hz clock periods before the WAKEUP
signal is asserted. Once the 14.7456 MHz oscillator is
stable, the PLLs require 250 µs to lock.
Boot), the Wakeup pin must not be asserted for two 1
Hz clock periods after assertion of nPOR to allow time
NOTE: *VDDC = VDDCmin
Data Sheet
tOSC32 (32 kHz)
tOSC14 (14 MHz)
Figure 48 shows the behavior of the LH7A404 when
At Power-On, nPOR must be held LOW until the
On transition from Standby to Run (including a Cold
PARAMETER
WAKEUP
XTAL32
XTAL14
VDDC
nPOR
VDDCmin
32.768 kHz Oscillator Stabilization Time after Power On*
14.7456 MHz Oscillator Stabilization Time after WAKEUP
tOSC32
DESCRIPTION
Table 13. Reset AC Timing
Figure 48. PLL Start-up
tOSC14
Version 1.5
for sampling BATOK and nEXTPWR. The delay
prevents a false ‘battery good’ indication caused by
alkaline battery recovery that can immediately follow a
battery-low switch off.
“Implementing Auto-Wakeup on the LH7A4xx Series
Devices” at www.sharpsma.com.
nRESETOUT Timing Sequence
each of the three reset triggers (nPOR, nURESET, and
nPWRFL) in Figure 49 through Figure 51, and timing
values are presented in Table 14 through Table 16.
For more information, see the application note
Timing for the nRESETOUT sequence is shown for
MIN. MAX.
550
2.5
UNIT
ms
ms
LH7A404
LH7A404-22
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