CSR8635 View Datasheet(PDF) - CSR plc

Part Name

Description

Manufacturer

CSR8635

The CSR8635 QFN single-chip Bluetooth® audio ROM device targets mid-range stereo speakers and headsets.

CSR plc

CSR8635 Datasheet PDF : 105 Pages

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The RST# pin is an active low reset and is internally filtered using the internal low frequency clock oscillator. CSR

recommends applying RST# for a period >5ms.

At reset the digital I/O pins are set to inputs for bidirectional pins and outputs are set to tristate.

10.10.1 Digital Pin States on Reset

Table 10.2 shows the pin states of CSR8635 QFN on reset.

Pin Name

I/O Type

Full Chip Reset Pin Name

I/O Type

Full Chip Reset

USB_DP

Digital bidirectional

N/A

PIO[9]

Digital bidirectional

PDS

USB_DN

Digital bidirectional

N/A

PIO[10]

Digital bidirectional

013 PIO[0]

27, 2 PIO[1]

ber PIO[2]

eptem PIO[3]

ay, S PIO[4]

- Frid PIO[5]

.cn PIO[6]

t.com PIO[7]

elpoin PIO[8]

Digital bidirectional

PUS

PDW

PDS

PUS

PIO[11]

PIO[12]

PIO[13]

PIO[14]

PIO[15]

PIO[16]

PIO[17]

PIO[18]

PIO[21]

Digital bidirectional

- exc Table 10.2: Pin States on Reset

.zhou Note:

en PUS = Strong pull-up

kev PDS = Strong pull-down

gbo PUW = Weak pull-up

r qin PDW = Weak pull-down

ed fo 10.10.2 Status After Reset

par The status of CSR8635 QFN after a reset is:

Pre ■ Warm reset: baud rate and RAM data remain available

■ Cold reset: baud rate and RAM data not available

PDS

PUS

PDS

PUS

PDS

PDW

10.11 Automatic Reset Protection

CSR8635 QFN includes an automatic reset protection circuit which restarts/resets CSR8635 QFN when an unexpected

reset occurs, e.g. ESD strike or lowering of RST#. The automatic reset protection circuit enables resets from the VM

without the requirement for external circuitry.

Note:

The reset protection is cleared after typically 2s (1.6s min to 2.4s max).

If RST# is held low for >2.4s CSR8635 QFN turns off. A rising edge on VREGENABLE or VCHG is required to

power on CSR8635 QFN.

Production Information

Confidential Information - This Material is Subject to CSR's Non-disclosure Agreement

Page 64 of 105

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