Data Sheet
LC840PA
Datasheet
https://www.lairdconnect.com
19
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Recommended Operating Parameters Notes:
Note 1
4.7 uF internal to module on VDD. The internal DCDC convertor or LDO is decided by the underlying Bluetooth
LE stack. For IEEE802.15.4:2006 operation, the internal DCDC convertor is enabled to minimize power
consumption.
Note 2
This is the maximum VDD or VDD_HV ripple or noise (at any frequency) that does not disturb the radio.
Note 3
The on-board power-on reset circuitry may not function properly for rise times longer than the specified maximum.
Note 4
LC840PA power supply options:
▪ Option 1 – Normal voltage power supply mode entered when the external supply voltage is connected to
both the VDD and VDD_HV pins (so that VDD equals VDD_HV). Connect external supply within range 3.0V
to 3.6V range to LC840PA VDD and VDD_HV pins.
OR
▪ Option 2 – High voltage mode power supply mode (using LC840PA VDD_HV pin) entered when the
external supply voltage in ONLY connected to the VDD_HV pin and the VDD pin is not connected to any
external voltage supply. Connect external supply within range 3.0V to 5.5V range to LC840PA VDD_HV pin.
LC840PA VDD pin left unconnected.
For either option, if you use USB interface then the LC840PA VBUS pin must be connected to external supply
within the range 4.35V to 5.5V. When using the LC840PA VBUS pin, you MUST externally fit a 4.7uF to ground.
For IEEE 802.15.4:2006 operation, the USB interface is not supported.
Table 4: Signal levels for interface, SIO
Parameter
Min
Typ
Max
Unit
V
IH
Input high voltage
0.7 VDD
VDD
V
V
IL
Input low voltage
VSS
0.3 x VDD
V
V
OH
Output high voltage
(std. drive, 0.5 mA) (Note 1)
(high-drive, 3 mA) (Note 1)
(high-drive, 5mmA) (Note 2)
VDD -0.4
VDD -0.4
VDD -0.4
VDD
VDD
VDD
V
V
V
OL
Output low voltage
(std. drive, 0.5 mA) (Note 1)
(high-drive, 3nmA) (Note 1)
(high-drive, 5mmA) (Note 2)
VSS
VSS
VSS
VSS+0.4
VSS+0.4
VSS+0.4
V
V
V
OL
Current at VSS+0.4V, Output set low
(std. drive, 0.5 mA) (Note 1)
(high-drive, 3 mA) (Note 1)
(high-drive, 5 mA) (Note 2)
1
3
6
2
-
10
4
-
15
mA
mA
mA
V
OL
Current at VDD -0.4, Output set low
(std. drive, 0.5 mA) (Note 1)
(high-drive, 3 mA) (Note 1)
(high-drive, 5 mA) (Note 2)
1
3
6
2
-
9
4
-
14
mA
mA
mA
Pull up resistance
11
13
16
kΩ
Pull down resistance
11
13
16
kΩ
Pad capacitance
3
pF
Pad capacitance at NFC pads
4
pF