DEMO9S08QG8E Freescale Semiconductor, DEMO9S08QG8E Datasheet - Page 8
![BOARD DEMO FOR MC9S08QG8](/photos/9/22/92298/mfg_demo9s08qg8__demo9s08qg8e_sml.jpg)
DEMO9S08QG8E
Manufacturer Part Number
DEMO9S08QG8E
Description
BOARD DEMO FOR MC9S08QG8
Manufacturer
Freescale Semiconductor
Type
MCUr
Specifications of DEMO9S08QG8E
Contents
Board
Processor To Be Evaluated
MC9S08QG8
Data Bus Width
8 bit
Interface Type
RS-232, USB
Silicon Manufacturer
Freescale
Core Architecture
HCS08
Core Sub-architecture
HCS08
Silicon Core Number
MC9S08
Silicon Family Name
S08QG
Kit Contents
MC9S08QG8 Board, Software, Cables, Connectors
Rohs Compliant
Yes
For Use With/related Products
MC9S08QG4, MC9S08QG8
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
DEMO9S08QG8E
Manufacturer:
Freescale Semiconductor
Quantity:
135
POWER SELECT
Power may be applied to the board through the integrated USB-BDM circuitry, a 2.0mm barrel
connector, or through connector J1. Power selection is achieved by using 2 option headers:
PWR_SEL option header and the VX_EN option header.
The PWR_SEL option header selects power input either from the integrated USB-BDM
circuitry or from the on-board voltage regulator. Power input selection, from the USB-BDM or
the on-board power supply, is mutually exclusive. This prevents power-input contention from
damaging the board. The figure below details the PWR_SEL header connections.
PWR_SEL
Figure 1: PWR_SEL Option Header
Power from the integrated BDM is drawn from the USB bus and is limited to 500mA.
Excessive current drain will violate the USB specification will cause the USB bus to disconnect.
The on-board voltage regulator (VR1) accepts power input through a 2.0mm barrel connector
(PWR). Input voltage may range from +5V to +18V. The voltage regulator (VR1) provides a
+3.3V fixed output limited to 250mA. Over-temperature and over-current limits built into the
voltage regulator protects the device from excessive stresses.
The user should consider the maximum output current limit of the selected power source when
attempting to power off-board circuitry through connector J1.
VX_EN
The VX_EN option header is a 2-pin jumper that connects the target board voltage rail to J1-1.
J1-3 is connected directly to the ground plane. Use of this feature requires a regulated +3.3V
input power source. This power input is decoupled to minimize noise input but is not
regulated. Care should be exercised when using this feature; no protection is applied on this
input and damage to the target board may result if over-driven. Also, do not attempt to power
the target board through this connector while also applying power through the USB-BDM or the
PWR connector; damage to the board may result.
8
VB
VB
CAUTION: Violating the USB specification will cause the USB bus to disconnect. This will
PWR_SEL
PWR_SEL
▪
▪
▪
▪
VDD
VDD
▪
▪
cause the board to reset.
CONFIGURATION:
Select power input from USB-BDM
Select power input from VR1
Freescale Semiconductor