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IS1677SM

Bluetooth® 4.0 Dual Mode Module

Unspecified 

RN4677

1.5 Status Indication I/O Pins

I/O pins P15 and P04 are Status Indicator 1 and 2 signals, respectively, which both provide status indication to the MCU

as shown in Table 1-4.

TABLE 1-4: STATUS INDICATION

P04/STATUS_IND_2

H

H

L

L

P15/STATUS_IND_1

H

L

H

L

Indication

Power default/Shutdown state

Access state

Link state (no UART data being transmitted)

Link state (UART data being transmitted)

1.6 Software Button (SW_BTN)

The Software Button (SW_BTN) input pin powers the

RN4677 on (high) or off (low).

1.7 WAKE UP (WAKEUP)

The Wake Up (WAKEUP) input pin wakes the RN4677

from shutdown mode (active-low).

1.8 RESET (RST_N)

The Reset (RST_N) input pin resets the RN4677

(active-low pulse for at least 63 ns).

1.9 Status LED (LED1)

The status LED (LED1) indicates:

• Standby

• Inquiry

• Link

• Link Back

• Low Battery

• Page

Each indication is a configurable flashing sequence.

LED brightness can also be configured.

1.10 System Configuration

To turn RN4677 into operation modes, set configuration

for I/O pins P20, P24 and EAN, see Table 1-5. Both

P20 and P24 have internal pull ups, whereas EAN has

internal pull down.

1.11 Power

Figure 1-4 shows an example power scheme using a

3.3V Low Dropout (LDO) regulator supplying 3.3 V to

both the RN4677 (BAT_IN and VDD_IO) and MCU

VDD. This power scheme ensures that RN4677 and

MCU I/O voltages are compatible.

Figure 1-5 shows an example power scheme using a

3.7V lithium-ion battery. The RN4677 has an internal

3.3V LDO regulator. Battery power is applied to

BAT_IN pin. The regulated 3.3V output is on the

LDO33_O pin. From the LDO33_O pin, voltage is

routed to the VDD_IO pin and external circuitry

including the MCU. This power scheme ensures that

RN4677 and MCU I/O voltages are compatible.

CAUTION

The internal 3.3V LDO current source:

50 mA maximum.

Otherwise, damage to RN4677 PICtail may occur.

TABLE 1-5:

P20

High

Low

Low

SYSTEM CONFIGURATION SETTINGS

P24

EAN

High

High

Low

Low

Low

High

Operational Mode

Normal operation

Test (Write EEPROM)

Write Flash (Firmware programming)

 2015 Microchip Technology Inc.

Advance Information

DS50002370A-page 7

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