AK4650 Datasheet, PDF (52/86 Pages) Asahi Kasei Microsystems – 16Bit ΔΣ CODEC with MIC/HP/SPK-AMP & TSC

[AK4650]
4. Wake Up Time
The AK4650 can measures the touch screen position by 12bit ADC at arround 50ms from power-down state.
(1) Wake Up from PR4 bit = “1” and PR5 bit = “1”
The time from pen touch to position measurement available dependes on CPU, X’tal oscillator and the driver in addition
to the AK4650. T5 and T7 depend on the AK4650. T7 is less than 1µs. T5 (X’tal oscillation stable and BITCLK is output)
is 20ms.
T1 : From pen touch to SDATAIN output => depends on touch screen
T2 : The AK4650 outputs SDATAIN and CPU outputs SYNC => depends on CPU
T3 : SYNC “H” time => depends on CPU, more than 1µs
T4 : From SYNC falling edge to X’tal oscillation start => depends on CPU
T5 : X’tal oscillation stable and BITCLK is output => depends on X’tal
T6 : From CPU receives BITCLK to CPU outputs SYNC => depends on CPU
T7 : From the AK4650 receives SYNC to the AK4650 outputs CODEC Ready => 162.8ns
T8 : From CPU receives CODEC Ready to CPU reads ADC data => depends on CPU
TS C Touc h
IN T N
S DA TA IN
SYNC
C ry s tal O c ilator
B ITC LK
12bit A D C
T2
T1
T3
T4
T5
T6
T7
T8
Figure 40. AC-Link Wake Up Timing (PR5 bit = “1”)
5. Pen Interrupt
The AK4650 outputs pen interrupt signal when pen interrupt is enabled and pen touch is detected.
(1) When PENINT bit is “1”, INTN pin goes to “L”
(2) When AC-Link operates, GINT bit is “1” and SLOT bit is “1”, bit 0 of slot 12 on SDATAIN goes to “1”.
(3) When PINTR bit is “1”, DTPEN bit (Addr=6AH: D2) output the pen touch detection result.
GPIO pin of the controller is not needed in case of (2) or (3).
MS0502-E-01
- 52 -
2007/04