Enhanced Class 1 Bluetooth v2.1 Module
Hardware Integration Guide
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www.lairdtech.com/bluetooth
10
CONN-HIG-BT740
3.3
Electrical Specifications
3.3.1
Absolute Maximum Ratings
Absolute maximum ratings for supply voltage and voltages on digital and analogue pins of the module are
listed below.
WARNING: Exceeding the following values causes permanent damage to the device.
Parameter
Min
Max
Unit
Peak current of power supply
0
200
mA
Voltage at digital pins
-0.4
3.7
V
Voltage at POWER pin
2.9 *
6.0
V
3.3.2
Recommended Operating Parameters
3.3.2.1
Power Supply
Signal Name
Pin No
I/O
Voltage level
Comments
VCC_IN
11
I
3.0 V to 5.0 V *
Typ 3.5 V
I
typ
= 115 mA
GND
1, 12, 15, 20
Four (4) ground terminals to be attached
in parallel.
VCC_3V3_monitor 13
O
3.3 V typical
For monitoring only. No current source
Note: VCC_3V3_monitor refers to internal voltage generated by the LDO inside the module which is
typically 3.3 V. So to achieve 3.3 V for VCC_3V3_monitor (at Max Tx Power) requires VCC_IN of
3.5 V. IO voltage levels follows VCC_3V3_monitor. At minimum VCC_VIN of 3.3 V, the internal
LDO generates 3.3 V but when Radio Tx at max Tx power, VCC_3V3_monitor drops a little (to
~3.15 V).
3.3.2.2
Signal Levels for Interface, GPIO (and SPI)
Signal Type
Signal level
Signal level at 0 mA load
Input
VILmin= -0.4V
VILmax=0.8V
VIHmin=2.3V
VIHmax=3.7V
Output
VOLmax=0.2V
VOHmin=3.1V
3.3.2.3
UART Interface
Signal Name
Pin No
I/O
Comments
UART_TX
23
O
UART_RX
22
I
UART_CTS
25
I
UART_RTS
24
O
UART_DSR
16
I
